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 |
|---|---|---|---|---|
| 246 | zygote | noun StudyField: Grade 9 life-science and ecology term Word study: Base-form focus: zygote is the dictionary headword; compare its inflected or derived forms in context. | 1. ζυγωτό 2. ζυγώτης | The zygote begins dividing soon after fertilization. |
| 247 | fertilization | noun StudyField: Grade 9 life-science and ecology term Word study: Suffix focus: -ization forms a noun for a process of making or becoming. | γονιμοποίηση | Fertilization combines genetic material from two parents. |
| 248 | hereditary pattern | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: hereditary + pattern. Study the complete expression as one field-specific unit. | κληρονομικό πρότυπο | The pedigree revealed a hereditary pattern linked to a recessive allele. |
| 249 | Punnett square | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: Punnett + square. Study the complete expression as one field-specific unit. | Πλατεία Punnett | The Punnett square shows a one-in-four chance of the recessive genotype. |
| 250 | Mendelian inheritance | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: Mendelian + inheritance. Study the complete expression as one field-specific unit. | Μεντελική κληρονομιά | A single-gene dominant trait may follow Mendelian inheritance. |
| 251 | incomplete dominance | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: incomplete + dominance. Study the complete expression as one field-specific unit. | ημιτελής κυριαρχία | Red and white flowers produce pink offspring through incomplete dominance. |
| 252 | codominance | noun StudyField: Grade 9 life-science and ecology term Word study: Suffix focus: -ance commonly forms a noun naming an action, quality, or state. | συγκυριαρχία | Human AB blood type demonstrates codominance. |
| 253 | polygenic trait | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: polygenic + trait. Study the complete expression as one field-specific unit. | πολυγονιδιακό χαρακτηριστικό | Human height is a polygenic trait also affected by environment. |
| 254 | sex chromosome | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: sex + chromosome. Study the complete expression as one field-specific unit. | φυλετικό χρωμόσωμα | The X chromosome is a human sex chromosome. |
| 255 | autosome | noun StudyField: Grade 9 life-science and ecology term Word study: Base-form focus: autosome is the dictionary headword; compare its inflected or derived forms in context. | αυτόσωμα | Humans normally have twenty-two pairs of each autosome type. |
| 256 | genetic variation | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: genetic + variation. Study the complete expression as one field-specific unit. | γενετική παραλλαγή | Genetic variation gives natural selection material on which to act. |
| 257 | genetic disorder | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: genetic + disorder. Study the complete expression as one field-specific unit. | γενετική διαταραχή | A genetic disorder may result from one altered gene or an extra chromosome. |
| 258 | genetic carrier | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: genetic + carrier. Study the complete expression as one field-specific unit. | γενετικός φορέας | A genetic carrier can pass the recessive allele to a child. |
| 259 | gene expression | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: gene + expression. Study the complete expression as one field-specific unit. | γονιδιακή έκφραση | Environmental signals can change gene expression without altering the DNA sequence. |
| 260 | gene regulation | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: gene + regulation. Study the complete expression as one field-specific unit. | γονιδιακή ρύθμιση | Gene regulation allows liver cells and nerve cells to use different sets of genes. |
| 261 | biotechnology | noun StudyField: Grade 9 life-science and ecology term Word study: Root and suffix focus: -logy means the study of a subject. | βιοτεχνολογία | Biotechnology enables microbes to produce human insulin. |
| 262 | genetic engineering | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: genetic + engineering. Study the complete expression as one field-specific unit. | βιογενετική | Genetic engineering added a disease-resistance gene to the plant. |
| 263 | cloning | noun StudyField: Grade 9 life-science and ecology term Word study: Base-form focus: cloning is the dictionary headword; compare its inflected or derived forms in context. | κλωνοποίηση | Researchers use cloning to create many copies of a useful gene. |
| 264 | stem cell | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: stem + cell. Study the complete expression as one field-specific unit. | βλαστοκύτταρο | A stem cell can produce several kinds of blood cell. |
| 265 | gene therapy | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: gene + therapy. Study the complete expression as one field-specific unit. | γονιδιοθεραπεία | Gene therapy supplied working copies of a missing gene. |
| 266 | selective breeding | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: selective + breeding. Study the complete expression as one field-specific unit. | επιλεκτική εκτροφή | Farmers used selective breeding to develop wheat with shorter stems. |
| 267 | selective pressure | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: selective + pressure. Study the complete expression as one field-specific unit. | επιλεκτική πίεση | Antibiotic use creates selective pressure favoring resistant bacteria. |
| 268 | common ancestor | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: common + ancestor. Study the complete expression as one field-specific unit. | κοινός πρόγονος | Humans and chimpanzees share a common ancestor. |
| 269 | homologous structure | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: homologous + structure. Study the complete expression as one field-specific unit. | ομόλογη δομή | A whale flipper and a human arm are a homologous structure in evolutionary comparison. |
| 270 | analogous structure | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: analogous + structure. Study the complete expression as one field-specific unit. | ανάλογη δομή | A bird wing and an insect wing are an analogous structure. |
| 271 | vestigial structure | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: vestigial + structure. Study the complete expression as one field-specific unit. | υπολειμματική δομή | A whale's small pelvic bone is a vestigial structure. |
| 272 | fossil record | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: fossil + record. Study the complete expression as one field-specific unit. | αρχείο απολιθωμάτων | The fossil record documents major changes in horse ancestors. |
| 273 | geographic isolation | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: geographic + isolation. Study the complete expression as one field-specific unit. | γεωγραφική απομόνωση | A new river caused geographic isolation between two lizard populations. |
| 274 | reproductive isolation | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: reproductive + isolation. Study the complete expression as one field-specific unit. | αναπαραγωγική απομόνωση | Different mating seasons can create reproductive isolation. |
| 275 | genetic drift | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: genetic + drift. Study the complete expression as one field-specific unit. | γενετική παρέκκλιση | A storm that kills organisms by chance can cause genetic drift. |
| 276 | gene flow | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: gene + flow. Study the complete expression as one field-specific unit. | γονιδιακή ροή | Windblown pollen creates gene flow between distant plant populations. |
| 277 | bottleneck effect | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: bottleneck + effect. Study the complete expression as one field-specific unit. | εφέ συμφόρησης | A severe wildfire produced a bottleneck effect in the isolated rabbit population. |
| 278 | founder effect | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: founder + effect. Study the complete expression as one field-specific unit. | ιδρυτικό αποτέλεσμα | The island colony shows a founder effect because it began with three birds. |
| 279 | extinction rate | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: extinction + rate. Study the complete expression as one field-specific unit. | ποσοστό εξαφάνισης | Habitat destruction can raise the extinction rate. |
| 280 | mass extinction | noun StudyField: Grade 9 life-science and ecology term Word study: Term structure: mass + extinction. Study the complete expression as one field-specific unit. | μαζική εξαφάνιση | The end-Permian mass extinction eliminated most marine species. |
Vocabulary reading and practice
Page 8 vocabulary review
Review five selected words from page 8.
English reading
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Greek translation
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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).