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 |
|---|---|---|---|---|
| 456 | residual | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: residual is the dictionary headword; compare its inflected or derived forms in context. | 잔여 | A positive residual means the observation lies above the prediction. |
| 457 | residual plot | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: residual + plot. Study the complete expression as one field-specific unit. | 잔차 그림 | A curved pattern in the residual plot suggests that a linear model is unsuitable. |
| 458 | interpolation | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -ation commonly forms a noun naming an action, process, or result. | 보간 | Interpolation estimates the temperature between two recorded times. |
| 459 | two-column proof | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: two + column + proof. Study the complete expression as one field-specific unit. | 2단 증명 | The two-column proof pairs each angle claim with a definition or theorem. |
| 460 | paragraph proof | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: paragraph + proof. Study the complete expression as one field-specific unit. | 1. 서술식 증명 2. 문단형 증명 | The paragraph proof explains why corresponding parts of the triangles are congruent. |
| 461 | logical statement | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: logical + statement. Study the complete expression as one field-specific unit. | 논리적 진술 | “Seven is prime” is a true logical statement. |
| 462 | conditional statement | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: conditional + statement. Study the complete expression as one field-specific unit. | 조건문 | The conditional statement says that if an angle is right, then it measures ninety degrees. |
| 463 | converse | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: converse is the dictionary headword; compare its inflected or derived forms in context. | 역 | The converse of “if it is a square, then it is a rectangle” is not always true. |
| 464 | inverse | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: inverse is the dictionary headword; compare its inflected or derived forms in context. | 이 | The inverse does not necessarily share the original statement's truth value. |
| 465 | contrapositive | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: contrapositive is the dictionary headword; compare its inflected or derived forms in context. | 대우 | A conditional and its contrapositive are logically equivalent. |
| 466 | biconditional | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: biconditional is the dictionary headword; compare its inflected or derived forms in context. | 이중조건부 | A biconditional can be written with the phrase “if and only if.” |
| 467 | truth value | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: truth + value. Study the complete expression as one field-specific unit. | 진릿값 | A counterexample proves that the universal statement has a false truth value. |
| 468 | axiomatic system | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: axiomatic + system. Study the complete expression as one field-specific unit. | 공리 시스템 | Euclidean geometry is an axiomatic system. |
| 469 | congruence theorem | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: congruence + theorem. Study the complete expression as one field-specific unit. | 합동 정리 | The side-angle-side congruence theorem proves the triangles match. |
| 470 | similarity theorem | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: similarity + theorem. Study the complete expression as one field-specific unit. | 유사성 정리 | The angle-angle similarity theorem applies to the two triangles. |
| 471 | triangle congruence | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: triangle + congruence. Study the complete expression as one field-specific unit. | 삼각형 합동 | Three corresponding side lengths can establish triangle congruence. |
| 472 | angle relationship | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: angle + relationship. Study the complete expression as one field-specific unit. | 각도 관계 | The diagram shows an angle relationship between alternate interior angles. |
| 473 | parallel line | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: parallel + line. Study the complete expression as one field-specific unit. | 평행선 | Each rail is a parallel line relative to the other. |
| 474 | algorithmic procedure | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: algorithmic + procedure. Study the complete expression as one field-specific unit. | 알고리즘 절차 | The sorting program follows an algorithmic procedure. |
| 475 | pseudocode | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: pseudocode is the dictionary headword; compare its inflected or derived forms in context. | 1. 의사코드 2. 슈도코드 | The pseudocode states when the loop should stop. |
| 476 | flowchart | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: flowchart is the dictionary headword; compare its inflected or derived forms in context. | 흐름도 | The flowchart sends a failed login back to the password step. |
| 477 | variable declaration | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: variable + declaration. Study the complete expression as one field-specific unit. | 변수 선언 | The variable declaration reserves storage for the score. |
| 478 | data type | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: data + type. Study the complete expression as one field-specific unit. | 데이터 유형 | A Boolean data type stores true or false. |
| 479 | Boolean | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Capitalization focus: Boolean is conventionally capitalized because the term comes from the name George Boole. | 1. 불리언값 2. 부울값 | The comparison returns a Boolean. |
| 480 | conditional branch | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: conditional + branch. Study the complete expression as one field-specific unit. | 조건부 분기 | The conditional branch displays an error when the password is incorrect. |
| 481 | loop | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: loop is the dictionary headword; compare its inflected or derived forms in context. | 1. 반복문 2. 루프 | The loop processes every item in the list. |
| 482 | loop iteration | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: loop + iteration. Study the complete expression as one field-specific unit. | 루프 반복 | During each loop iteration, the index increases by one. |
| 483 | debugging | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: debugging is the dictionary headword; compare its inflected or derived forms in context. | 1. 디버그 2. 디버깅 | Debugging revealed that the program compared text instead of numbers. |
| 484 | compiler | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: compiler is the dictionary headword; compare its inflected or derived forms in context. | 컴파일러 | The compiler reported a missing bracket. |
| 485 | interpreter | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Base-form focus: interpreter is the dictionary headword; compare its inflected or derived forms in context. | 1. 인터프리터 2. 해석기 | The interpreter stopped when it encountered an undefined name. |
| 486 | source code | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: source + code. Study the complete expression as one field-specific unit. | 소스 코드 | The developer reviewed the source code before releasing the update. |
| 487 | object code | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: object + code. Study the complete expression as one field-specific unit. | 객체 코드 | The compiler converted the program into object code. |
| 488 | network security | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: network + security. Study the complete expression as one field-specific unit. | 네트워크 보안 | Network security includes firewalls, monitoring, and controlled permissions. |
| 489 | data encryption | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: data + encryption. Study the complete expression as one field-specific unit. | 데이터 암호화 | Data encryption protects the message while it travels across the network. |
| 490 | decryption | noun StudyField: Grade 9 mathematics, computing, and data-literacy term Word study: Suffix focus: -tion commonly forms a noun naming an action, process, or result. | 해독 | Authorized decryption requires the correct key. |
Vocabulary reading and practice
Page 14 vocabulary review
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English reading
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Vocabulary quiz
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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).