1. (noun) reason, ground
a rational motive for a belief or action
Synonyms: ground, priming coat, intellect, primer, cause, background, reasonableness, undercoat, basis, grounds, solid ground, dry land, primer coat, footing, land, priming, soil, reason, rationality, flat coat, understanding, earth, terra firma
2. (noun) reason
an explanation of the cause of some phenomenon
Synonyms: cause, grounds, ground, intellect, understanding, reasonableness, rationality
3. (noun) reason, understanding, intellect
the capacity for rational thought or inference or discrimination
Synonyms: intellect, rationality, savvy, apprehension, discernment, cause, reason, grounds, reasonableness, intellectual, agreement, ground, mind, sympathy, understanding
4. (noun) rationality, reason, reasonableness
the state of having good sense and sound judgment
Synonyms: tenability, intellect, rationality, moderateness, modestness, rationalness, reason, grounds, reasonableness, tenableness, ground, cause, understanding
5. (noun) cause, reason, grounds
a justification for something existing or happening
Synonyms: ground, suit, intellect, causal agency, yard, crusade, drive, effort, causa, evidence, case, campaign, reasonableness, movement, curtilage, reason, rationality, grounds, lawsuit, understanding, cause, causal agent
6. (verb) reason
a fact that logically justifies some premise or conclusion
Synonyms: cause, grounds, ground, intellect, understanding, reasonableness, rationality
7. (verb) reason, reason out, conclude
decide by reasoning; draw or come to a conclusion
Synonyms: conclude, resolve, reason, reason out, argue, close
8. (verb) argue, reason
present reasons and arguments
Synonyms: reason out, indicate, debate, reason, conclude, fence, argue, contend
9. (verb) reason
think logically
Synonyms: conclude, reason out, argue
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Synonyms and Antonyms of reason 
