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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Words 386–420 of 800
#	Word	Details	Meaning	Sample sentence
386	mantle plume	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: mantle + plume. Study the complete expression as one field-specific unit.	a proposed column of unusually hot rock rising through Earth's mantle	A mantle plume may supply magma to the hotspot.
387	P wave	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: P + wave. Study the complete expression as one field-specific unit.	a compressional seismic wave that travels fastest through Earth's interior	The P wave arrived before the other seismic waves.
388	S wave	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: S + wave. Study the complete expression as one field-specific unit.	a transverse seismic wave that cannot travel through liquid	The absence of an S wave through the outer core helped reveal that the layer is liquid.
389	rain shadow	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: rain + shadow. Study the complete expression as one field-specific unit.	a dry region on the downwind side of a mountain range	The desert lies in a rain shadow beyond the coastal mountains.
390	drainage basin	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: drainage + basin. Study the complete expression as one field-specific unit.	the land area from which water flows into one river, lake, or other outlet	Pollution upstream can affect the entire drainage basin.
391	climate system	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: climate + system. Study the complete expression as one field-specific unit.	the interacting atmosphere, ocean, ice, land, and living components that shape climate	The climate system transfers heat through winds and ocean currents.
392	positive feedback	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: positive + feedback. Study the complete expression as one field-specific unit.	a process in which an initial change produces effects that increase that change	Melting ice creates positive feedback because darker water absorbs more sunlight.
393	negative feedback	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: negative + feedback. Study the complete expression as one field-specific unit.	a process in which an initial change produces effects that reduce that change	Heat loss from warmer Earth acts as a negative feedback.
394	carbon sink	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: carbon + sink. Study the complete expression as one field-specific unit.	a reservoir that absorbs more carbon than it releases	A growing forest can function as a carbon sink.
395	albedo	noun Study Field: 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.	the fraction of incoming light that a surface reflects	Fresh snow has a high albedo.
396	ocean acidification	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ocean + acidification. Study the complete expression as one field-specific unit.	the decrease in ocean pH caused mainly by absorption of atmospheric carbon dioxide	Ocean acidification makes shell building harder for some organisms.
397	sea-level rise	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: sea + level + rise. Study the complete expression as one field-specific unit.	an increase in average ocean height caused by warming water and melting land ice	Sea-level rise increases coastal flood risk.
398	ecological footprint	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: ecological + footprint. Study the complete expression as one field-specific unit.	an estimate of the biologically productive area needed to support a person's or population's resource use	Eating less resource-intensive food can reduce an ecological footprint.
399	resource depletion	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: resource + depletion. Study the complete expression as one field-specific unit.	the use of a resource faster than it can be replaced or renewed	Overpumping groundwater causes resource depletion.
400	environmental justice	noun Study Field: Grade 9 physical, Earth, and environmental-science term Word study: Term structure: environmental + justice. Study the complete expression as one field-specific unit.	fair treatment and meaningful participation in environmental decisions and protections	Environmental justice asks why some communities face greater pollution exposure.
401	function rule	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: function + rule. Study the complete expression as one field-specific unit.	a mathematical instruction that assigns exactly one output to each permitted input	The function rule doubles each input and then adds three.
402	mathematical relation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: mathematical + relation. Study the complete expression as one field-specific unit.	a set of ordered pairs connecting values from two sets	The mathematical relation is not a function because one input has two outputs.
403	function notation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: function + notation. Study the complete expression as one field-specific unit.	symbolic notation, such as f(x), used to name a function and its input	In function notation, f(4) means the output when the input is four.
404	independent variable	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: independent + variable. Study the complete expression as one field-specific unit.	a variable chosen or controlled to examine its effect on another variable	Time is the independent variable on the horizontal axis.
405	dependent variable	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: dependent + variable. Study the complete expression as one field-specific unit.	a measured variable whose value may change in response to another variable	Plant height is the dependent variable in the experiment.
406	input-output table	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: input + output + table. Study the complete expression as one field-specific unit.	a table pairing input values with the corresponding outputs of a rule	The input-output table reveals that every output is five more than its input.
407	arithmetic sequence	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: arithmetic + sequence. Study the complete expression as one field-specific unit.	a number sequence with a constant difference between consecutive terms	Three, seven, eleven, and fifteen form an arithmetic sequence.
408	geometric sequence	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: geometric + sequence. Study the complete expression as one field-specific unit.	a number sequence with a constant ratio between consecutive terms	Two, six, eighteen, and fifty-four form a geometric sequence.
409	recursive formula	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: recursive + formula. Study the complete expression as one field-specific unit.	a rule that defines each term by using one or more earlier terms	The recursive formula adds four to the preceding term.
410	explicit formula	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: explicit + formula. Study the complete expression as one field-specific unit.	a rule that calculates any term directly from its position	The explicit formula gives the fiftieth term without listing the earlier terms.
411	common difference	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: common + difference. Study the complete expression as one field-specific unit.	the constant amount added between consecutive terms of an arithmetic sequence	The sequence 5, 8, 11 has a common difference of three.
412	common ratio	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: common + ratio. Study the complete expression as one field-specific unit.	the constant multiplier between consecutive terms of a geometric sequence	The sequence 4, 12, 36 has a common ratio of three.
413	exponential function	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: exponential + function. Study the complete expression as one field-specific unit.	a function in which a constant base is raised to a variable exponent	The exponential function models a population that doubles each year.
414	quadratic function	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: quadratic + function. Study the complete expression as one field-specific unit.	a function whose highest variable power is two	The graph of a quadratic function is a parabola.
415	parabola	noun Study Field: 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.	a symmetrical U-shaped curve formed by the graph of a quadratic function	The ball's idealized path resembles a downward-opening parabola.
416	parabola vertex	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: parabola + vertex. Study the complete expression as one field-specific unit.	the turning point at which a parabola reaches its maximum or minimum value	The parabola vertex gives the projectile's greatest height.
417	axis of symmetry	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: axis + of + symmetry. Study the complete expression as one field-specific unit.	a line dividing a figure or graph into mirror-image halves	The axis of symmetry passes through the vertex of the parabola.
418	quadratic equation	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: quadratic + equation. Study the complete expression as one field-specific unit.	an equation whose highest variable power is two	The quadratic equation has two real solutions.
419	leading coefficient	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: leading + coefficient. Study the complete expression as one field-specific unit.	the coefficient of the term with the highest power	A negative leading coefficient makes this parabola open downward.
420	constant term	noun Study Field: Grade 9 mathematics, computing, and data-literacy term Word study: Term structure: constant + term. Study the complete expression as one field-specific unit.	a term without a variable	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.

Vocabulary quiz

Complete 5 review questions for this page.

1. The ___ passes through the vertex of the parabola.

Answer: axis of symmetry

2. Melting ice creates ___ because darker water absorbs more sunlight.

Answer: positive feedback

3. Plant height is the ___ in the experiment.

Answer: dependent variable

4. The ___ has two real solutions.

Answer: quadratic equation

5. Heat loss from warmer Earth acts as a ___.

Answer: negative feedback

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9th Grade Vocabulary Words

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