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Definitions

rationality

[rash-uh-nal-i-tee] / ˌræʃ əˈnæl ɪ ti /
NOUN
logic
Synonyms
STRONGEST
coherence good sense sanity
STRONG
argumentation connection deduction dialectic induction inference linkage philosophy ratiocination rationale reason relationship sense syllogism thesis
WEAK
antithesis and synthesis course of thought sound judgment syllogistics train of thought
NOUN
sense
Synonyms
STRONGEST
logic
STRONG
acceptation advantage burden core definition drift gist good heart implication import interpretation matter meat message nitty-gritty nuance nub purport purpose rationale rationalness reason short significance signification stuff substance thrust understanding upshot value worth
WEAK
bottom line denotatiton intendment meat and potatoes name of the game nature of the beast nuts and bolts punch line rhyme or reason significancy
Antonyms
STRONG
disadvantage exterior exteriority insignificance meaninglessness outside surface

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"These rules lack humanity and rationality, and they oppress us every day."

From Barron's • Jan. 9, 2026

We comfort the comfortable, and we look for hope in norms and in institutions and in rationality.

From Slate • Dec. 17, 2025

There’s some discussion of how mere rationality gets you only so far.

From The Wall Street Journal • Nov. 27, 2025

This work challenges long-held assumptions that rationality, defined as forming and updating beliefs based on evidence, belongs only to humans.

From Science Daily • Nov. 16, 2025

Some philosophers and nearly all anthropologists agreed: standards of rationality were, they insisted, local and highly variable.

From "The Invention of Science" by David Wootton

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.