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PSAT 8/9 vocabulary: order and chaos.

11 words about order and chaos — each with a definition, an example sentence, and a memory cue.

11 words · Free PDF · No account needed

The PSAT 8/9 tests vocabulary in context: a Reading and Writing question gives you a passage and asks which word fits, and the wrong answers are usually words that are close in meaning. Studying a whole theme at once is what builds that discrimination — you learn not just what each word means, but how it differs from its neighbors.

Read the definition, then the example, then the memory cue. Come back a few days later and cover the definitions — recalling a word cold is what fixes it, and rereading it is not.

The 11 words

Alphabetical. Everything in the Order & Chaos guide.

01
arbitraryadjective

based on random choice rather than reason

The selection process seemed arbitrary and unfair to the applicants, affecting how easily the group could coordinate its work and determine the next step.

Memory cueA blindfolded dart chooses the answer arbitrarily: by chance rather than reason.

02
assembleverb

to gather together or put parts together

Workers assemble the car parts on the factory floor, making the level of organization apparent to everyone involved in the effort.

Memory cueAssembly instructions gather separate parts and put them together into one machine.

03
catalognoun

a complete list of items arranged systematically

The library's catalog contains over a million book entries, affecting how easily the group could coordinate its work and determine the next step.

Memory cueA catalog is a master list whose items sit in neat, systematic order.

04
chaoticadjective

in a state of complete confusion

The chaotic scene overwhelmed rescuers, showing whether a clear structure guided the activity as conditions became more demanding.

Memory cueA chaotic room spins objects through complete confusion.

05
organizedadjective

arranged in a systematic way; well-planned

Her organized approach to studying helped her ace the exam, making the level of organization apparent to everyone involved in the effort.

Memory cueAn organized shelf places every labeled item in a planned, systematic position.

06
patternsnoun

repeated decorative designs; regular forms or sequences

Scientists studied the patterns in the data to find trends, affecting how easily the group could coordinate its work and determine the next step.

Memory cuePatterns repeat the same shapes, colors, or steps in a recognizable sequence.

07
preciseadjective

marked by exactness and accuracy

The surgeon's precise movements were impressive, showing whether a clear structure guided the activity as conditions became more demanding.

Memory cueA precise needle lands exactly on the ruler's thinnest mark.

08
rigorousadjective

extremely thorough and careful

The rigorous testing ensured safety, making the level of organization apparent to everyone involved in the effort.

Memory cueA rigorous inspection tests every part thoroughly and carefully.

09
schemenoun/verb

a large-scale systematic plan; a secret or underhanded plan

The government announced a new scheme to reduce unemployment, making the level of organization apparent to everyone involved in the effort.

Memory cueA scheme is a connected plan diagram, sometimes hidden behind a secret curtain.

10
structuredadjective

planned or organized according to a framework

The structured program had clear goals, showing whether a clear structure guided the activity as conditions became more demanding.

Memory cueA structured plan fits each part into an organized framework.

11
systematicadjective

done according to a fixed plan

The systematic review took months, making the level of organization apparent to everyone involved in the effort.

Memory cueA systematic plan places every action on a fixed numbered path.

Prefer paper? The printable Order & Chaos guide has all 11 words, ready to print. All 30 themes (479 words) are on the guide index; for the alphabetical reference, see the PSAT 8/9 vocabulary list.

Knowing the words is step one — seeing them tested is step two.

Test Ninjas puts these words back into real passages — a complete PSAT 8/9 course, practice questions, and an explanation on every answer.