English Vocabulary · Grade 9 Live Review Preview
9th Grade Vocabulary Words
Ninth grade marks the transition to high-school reading and writing across literature, argument, research, biology, physical and Earth science, algebra, computing, world history, civics, and geography. This level develops precise academic and domain-specific vocabulary while strengthening context, nuance, source evaluation, figurative language, and evidence-based communication.
This independently authored 800-word beta curriculum is arranged in twenty-three pages of up to thirty-five words. Pages containing words 1–500 include five cloze questions drawn only from that enhanced range; words 501–800 remain fully visible and editable as list pages while the expanded practice layer is developed. Each row includes a subject-field label and an editable word-study note about a transparent affix, compound structure, capitalization, or dictionary base form. The cited Grade 9 resources calibrate difficulty and study skills only; all learner-facing definitions, examples, quizzes, and descriptions are original KSSR copy.
Please note: the vocabulary lists for grades 9~11 have been selected to ensure no overlap with the previous grade level. If the words are too specialized or difficult for you, please go back to grade levels 4~8 and review the words on those pages.
Open the basic text version — works without JavaScript and is suitable for printing.
Your private study tools
Track your learning with My Vocabulary
Use the three small controls beside any word. Your choices stay attached to your account and appear in your My Vocabulary record.
- Star a difficult word to practise it again.
- Check a word when you have learned it.
- Add a note with a memory clue, synonym, or reminder.
These controls work during your free visits and save privately on this browser. Sign in to move them into your account’s My Vocabulary record.
| # | Word | Details | Meaning | Sample sentence |
|---|---|---|---|---|
| 351 | inelastic collision | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: inelastic + collision. Study the complete expression as one field-specific unit. | va chạm không đàn hồi | Cars that crumple together undergo an inelastic collision. |
| 352 | work-energy theorem | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: work + energy + theorem. Study the complete expression as one field-specific unit. | định lý công-năng lượng | The work-energy theorem connects the pushing force with the cart's increased speed. |
| 353 | ideal mechanical advantage | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ideal + mechanical + advantage. Study the complete expression as one field-specific unit. | lợi thế cơ học lý tưởng | A longer input arm increases a lever's ideal mechanical advantage. |
| 354 | conservation of energy | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: conservation + of + energy. Study the complete expression as one field-specific unit. | Bảo toàn năng lượng | Conservation of energy means the pendulum's potential and kinetic energy trade places. |
| 355 | gravitational potential energy | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: gravitational + potential + energy. Study the complete expression as one field-specific unit. | thế năng hấp dẫn | Lifting the backpack increases its gravitational potential energy. |
| 356 | elastic potential energy | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: elastic + potential + energy. Study the complete expression as one field-specific unit. | thế năng đàn hồi | A drawn bow contains elastic potential energy. |
| 357 | wave frequency | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + frequency. Study the complete expression as one field-specific unit. | tần số sóng | Increasing wave frequency raises the pitch of a sound. |
| 358 | wave amplitude | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + amplitude. Study the complete expression as one field-specific unit. | biên độ sóng | A louder sound usually has greater wave amplitude. |
| 359 | wave period | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + period. Study the complete expression as one field-specific unit. | chu kỳ sóng | A two-hertz wave has a wave period of half a second. |
| 360 | wave speed | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + speed. Study the complete expression as one field-specific unit. | tốc độ sóng | Wave speed depends on the medium through which the disturbance moves. |
| 361 | transverse wave | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: transverse + wave. Study the complete expression as one field-specific unit. | sóng ngang | A wave on a stretched rope can be a transverse wave. |
| 362 | longitudinal wave | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: longitudinal + wave. Study the complete expression as one field-specific unit. | sóng dọc | Sound in air travels as a longitudinal wave. |
| 363 | constructive interference | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: constructive + interference. Study the complete expression as one field-specific unit. | tăng | Two crests meeting create constructive interference. |
| 364 | destructive interference | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: destructive + interference. Study the complete expression as one field-specific unit. | sự can thiệp mang tính hủy diệt | A crest meeting a trough can cause destructive interference. |
| 365 | wave refraction | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + refraction. Study the complete expression as one field-specific unit. | khúc xạ sóng | Wave refraction bends light as it enters glass. |
| 366 | wave reflection | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: wave + reflection. Study the complete expression as one field-specific unit. | làn sóng phản xạ | An echo results from wave reflection. |
| 367 | standing wave | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: standing + wave. Study the complete expression as one field-specific unit. | sóng dừng | A vibrating guitar string forms a standing wave. |
| 368 | natural frequency | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: natural + frequency. Study the complete expression as one field-specific unit. | tần số tự nhiên | The tuning fork rings at its natural frequency. |
| 369 | Doppler effect | proper noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: Doppler + effect. Study the complete expression as one field-specific unit. | hiệu ứng Doppler | The Doppler effect makes an approaching siren sound higher. |
| 370 | electromagnetic spectrum | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: electromagnetic + spectrum. Study the complete expression as one field-specific unit. | 1. phổ điện từ 2. Phổ 3. từ | Visible light occupies a small part of the electromagnetic spectrum. |
| 371 | igneous rock | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: igneous + rock. Study the complete expression as one field-specific unit. | đá mácma | Granite is an igneous rock that cooled slowly underground. |
| 372 | sedimentary rock | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: sedimentary + rock. Study the complete expression as one field-specific unit. | đá trầm tích | Sandstone is a sedimentary rock made from cemented sand grains. |
| 373 | metamorphic rock | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: metamorphic + rock. Study the complete expression as one field-specific unit. | đá biến chất | Marble is a metamorphic rock formed from limestone. |
| 374 | rock weathering | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: rock + weathering. Study the complete expression as one field-specific unit. | phong hóa đá | Freezing water causes rock weathering by widening cracks. |
| 375 | sediment deposition | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: sediment + deposition. Study the complete expression as one field-specific unit. | lắng đọng trầm tích | Slower river water causes sediment deposition near the mouth. |
| 376 | soil horizon | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: soil + horizon. Study the complete expression as one field-specific unit. | 1. Phẫu diện 2. đất | Dark organic material is common in the upper soil horizon. |
| 377 | tectonic theory | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: tectonic + theory. Study the complete expression as one field-specific unit. | thuyết kiến tạo | Tectonic theory accounts for matching earthquake belts and plate boundaries. |
| 378 | continental movement | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: continental + movement. Study the complete expression as one field-specific unit. | phong trào lục địa | Fossil evidence helped scientists reconstruct continental movement. |
| 379 | seafloor spreading | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: seafloor + spreading. Study the complete expression as one field-specific unit. | tách giãn đáy biển | Magnetic stripes provide evidence for seafloor spreading. |
| 380 | convergent boundary | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: convergent + boundary. Study the complete expression as one field-specific unit. | ranh giới hội tụ | A deep trench can form at a convergent boundary. |
| 381 | divergent boundary | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: divergent + boundary. Study the complete expression as one field-specific unit. | ranh giới phân kỳ | New crust forms at an oceanic divergent boundary. |
| 382 | transform boundary | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: transform + boundary. Study the complete expression as one field-specific unit. | chuyển đổi ranh giới | Shallow earthquakes are common along a transform boundary. |
| 383 | earthquake focus | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: earthquake + focus. Study the complete expression as one field-specific unit. | tâm điểm trận động đất | Seismic waves spread outward from the earthquake focus. |
| 384 | moment magnitude | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: moment + magnitude. Study the complete expression as one field-specific unit. | Độ lớn mô men | The moment magnitude scale compares the energy of large earthquakes. |
| 385 | volcanic hotspot | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: volcanic + hotspot. Study the complete expression as one field-specific unit. | điểm nóng núi lửa | An island chain formed as a plate moved over a volcanic hotspot. |
Vocabulary reading and practice
Page 11 vocabulary review
Review five selected words from page 11.
English reading
Reading passage is being prepared.
Vietnamese translation
A reviewed translation is not available for this passage yet.
Vocabulary quiz
Choose the dictionary equivalent for each of 5 selected words.
Vocabulary chart page
This page focuses on the word chart. Reading passages appear once in each three-page group, while cloze quizzes remain in the established enhanced range for this level.
Sources and curriculum references
These references guide selection and calibration. Definitions, sample sentences, readings, questions, and teaching notes are independently written and reviewed.
- GreatSchools: 9th Grade Vocabulary Words
- Victoria University of Wellington: Coxhead Academic Word List
- Common Core: Language Standards for Grades 9–10
- Common Core: Science and Technical Subjects, Grades 9–10
- WikDict downloadable bilingual dictionaries
- Kaikki.org / Wiktextract machine-readable Wiktionary data
- Language-Learning-decks public flashcard datasets
- SBBIC English-to-Khmer Dictionary
- English–Khmer Dictionary Dataset (machine-generated Khmer fallback; human review required)
- PanLex meanings snapshot (direct CC0 gap candidates; human review required)
- Cambridge bilingual dictionaries (individual editorial sense checks)
- Collins English–Hindi Dictionary (individual editorial checks)
- Hindwi and Rekhta dictionaries (individual Hindi/Urdu checks)
- National Institute of Korean Language: Basic Korean Dictionary
- JMdict/EDRDG Japanese dictionary project
- CC-CEDICT Chinese dictionary project
- VDict Vietnamese Dictionary (individual editorial check)
- Google Translate (machine-assisted lesson-reading draft; fluent review required)
- Kuperman et al.: Age-of-acquisition ratings for 30,000 English words
- The Princeton Review, Word Smart (2006 and 2012 editions; bibliographic calibration only).