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 |
|---|---|---|---|---|
| 386 | mantle plume | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: mantle + plume. Study the complete expression as one field-specific unit. | 地幔柱 | A mantle plume may supply magma to the hotspot. |
| 387 | P wave | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: P + wave. Study the complete expression as one field-specific unit. | P波 | The P wave arrived before the other seismic waves. |
| 388 | S wave | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: S + wave. Study the complete expression as one field-specific unit. | S波 | The absence of an S wave through the outer core helped reveal that the layer is liquid. |
| 389 | rain shadow | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: rain + shadow. Study the complete expression as one field-specific unit. | 雨影 | The desert lies in a rain shadow beyond the coastal mountains. |
| 390 | drainage basin | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: drainage + basin. Study the complete expression as one field-specific unit. | 流域 | Pollution upstream can affect the entire drainage basin. |
| 391 | climate system | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: climate + system. Study the complete expression as one field-specific unit. | 气候系统 | The climate system transfers heat through winds and ocean currents. |
| 392 | positive feedback | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: positive + feedback. Study the complete expression as one field-specific unit. | 积极的反馈 | Melting ice creates positive feedback because darker water absorbs more sunlight. |
| 393 | negative feedback | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: negative + feedback. Study the complete expression as one field-specific unit. | 负面反馈 | Heat loss from warmer Earth acts as a negative feedback. |
| 394 | carbon sink | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: carbon + sink. Study the complete expression as one field-specific unit. | 碳汇 | A growing forest can function as a carbon sink. |
| 395 | albedo | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Base-form focus: albedo is the dictionary headword; compare its inflected or derived forms in context. | 反照率 | Fresh snow has a high albedo. |
| 396 | ocean acidification | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ocean + acidification. Study the complete expression as one field-specific unit. | 海洋酸化 | Ocean acidification makes shell building harder for some organisms. |
| 397 | sea-level rise | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: sea + level + rise. Study the complete expression as one field-specific unit. | 海平面上升 | Sea-level rise increases coastal flood risk. |
| 398 | ecological footprint | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ecological + footprint. Study the complete expression as one field-specific unit. | 生態足跡 | Eating less resource-intensive food can reduce an ecological footprint. |
| 399 | resource depletion | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: resource + depletion. Study the complete expression as one field-specific unit. | 资源枯竭 | Overpumping groundwater causes resource depletion. |
| 400 | environmental justice | noun StudyField: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: environmental + justice. Study the complete expression as one field-specific unit. | 环境正义 | Environmental justice asks why some communities face greater pollution exposure. |
| 401 | function rule | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: function + rule. Study the complete expression as one field-specific unit. | 函数规则 | The function rule doubles each input and then adds three. |
| 402 | mathematical relation | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: mathematical + relation. Study the complete expression as one field-specific unit. | 数学关系 | The mathematical relation is not a function because one input has two outputs. |
| 403 | function notation | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: function + notation. Study the complete expression as one field-specific unit. | 函数符号 | In function notation, f(4) means the output when the input is four. |
| 404 | independent variable | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: independent + variable. Study the complete expression as one field-specific unit. | 自变量 | Time is the independent variable on the horizontal axis. |
| 405 | dependent variable | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: dependent + variable. Study the complete expression as one field-specific unit. | 應變數 | Plant height is the dependent variable in the experiment. |
| 406 | input-output table | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: input + output + table. Study the complete expression as one field-specific unit. | 投入产出表 | The input-output table reveals that every output is five more than its input. |
| 407 | arithmetic sequence | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: arithmetic + sequence. Study the complete expression as one field-specific unit. | 算术序列 | Three, seven, eleven, and fifteen form an arithmetic sequence. |
| 408 | geometric sequence | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: geometric + sequence. Study the complete expression as one field-specific unit. | 几何序列 | Two, six, eighteen, and fifty-four form a geometric sequence. |
| 409 | recursive formula | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: recursive + formula. Study the complete expression as one field-specific unit. | 递归公式 | The recursive formula adds four to the preceding term. |
| 410 | explicit formula | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: explicit + formula. Study the complete expression as one field-specific unit. | 显式公式 | The explicit formula gives the fiftieth term without listing the earlier terms. |
| 411 | common difference | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: common + difference. Study the complete expression as one field-specific unit. | 1. 公差 2. 所为 | The sequence 5, 8, 11 has a common difference of three. |
| 412 | common ratio | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: common + ratio. Study the complete expression as one field-specific unit. | 所为 | The sequence 4, 12, 36 has a common ratio of three. |
| 413 | exponential function | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: exponential + function. Study the complete expression as one field-specific unit. | 指數函數 | The exponential function models a population that doubles each year. |
| 414 | quadratic function | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: quadratic + function. Study the complete expression as one field-specific unit. | 二次函数 | The graph of a quadratic function is a parabola. |
| 415 | parabola | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: parabola is the dictionary headword; compare its inflected or derived forms in context. | 抛物线 | The ball's idealized path resembles a downward-opening parabola. |
| 416 | parabola vertex | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: parabola + vertex. Study the complete expression as one field-specific unit. | 抛物线顶点 | The parabola vertex gives the projectile's greatest height. |
| 417 | axis of symmetry | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: axis + of + symmetry. Study the complete expression as one field-specific unit. | 對稱軸 | The axis of symmetry passes through the vertex of the parabola. |
| 418 | quadratic equation | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: quadratic + equation. Study the complete expression as one field-specific unit. | 1. 二次方程 2. 二次方程式 | The quadratic equation has two real solutions. |
| 419 | leading coefficient | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: leading + coefficient. Study the complete expression as one field-specific unit. | 首项系数 | A negative leading coefficient makes this parabola open downward. |
| 420 | constant term | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: constant + term. Study the complete expression as one field-specific unit. | 常数项 | In the expression 3x plus 7, seven is the constant term. |
Vocabulary reading and practice
Page 12 vocabulary review
Review five selected words from page 12.
English reading
Reading passage is being prepared.
Simplified Chinese 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).