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.
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| # | 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. | 非弾性衝突 | 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. | 仕事エネルギー定理 | 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. | 理想的な機械的利点 | 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. | エネルギーの保存 | 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. | 重力位置エネルギー | 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. | 弾性位置エネルギー | 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. | 波の周波数 | 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. | 波の振幅 | 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. | 波の周期 | 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. | 波の速さ | 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. | 横波 | 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. | 縦波 | 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. | 建設的な干渉 | 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. | 破壊的な干渉 | 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. | 波の屈折 | 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. | 波の反射 | 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. | 定常波 | 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. | 固有振動数 | 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. | ドップラー効果 | 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. | 電磁スペクトル | 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. | 火成岩 | 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. | 堆積岩 | 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. | 変成岩 | 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. | 岩石の風化 | 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. | 土砂の堆積 | 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. | 土壌の地平線 | 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. | 地殻変動理論 | 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. | 大陸移動 | 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. | 海底の広がり | 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. | 収束境界 | 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. | 発散境界 | 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. | 境界を変換する | 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. | 地震の焦点 | 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. | モーメントの大きさ | 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. | 火山ホットスポット | 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
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Japanese translation
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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).