- an explanation or justification of an act, idea, etc.
- a cause or motive
- the ability to think, form judgments, draw conclusions, etc.
- sound thought or judgment; good sense
- normal mental powers; a sound mind; sanity
Origin of reasonMiddle English reisun from Old French from Classical Latin ratio, a reckoning, reason: see read
- to think coherently and logically; draw inferences or conclusions from facts known or assumed
- to argue or talk in a logical way
- to think logically about; think out systematically; analyze
- to argue, conclude, or infer: now usually with a clause introduced by that as the object
- to support, justify, etc. with reasons
- to persuade or bring by reasoning (into or out of)
by reason of
out of all reason