1. reason, ground, rational motive

usage: a rational motive for a belief or action; "the reason that war was declared"; "the grounds for their declaration"

2. reason, explanation, account

usage: an explanation of the cause of some phenomenon; "the reason a steady state was never reached was that the back pressure built up too slowly"

3. reason, understanding, intellect, faculty, mental faculty, module

usage: the capacity for rational thought or inference or discrimination; "we are told that man is endowed with reason and capable of distinguishing good from evil"

4. rationality, reason, reasonableness, sanity, saneness

usage: the state of having good sense and sound judgment; "his rationality may have been impaired"; "he had to rely less on reason than on rousing their emotions"

5. cause, reason, grounds, justification

usage: a justification for something existing or happening; "he had no cause to complain"; "they had good reason to rejoice"

6. reason, fact

usage: a fact that logically justifies some premise or conclusion; "there is reason to believe he is lying"


1. reason, reason out, conclude, think, cogitate, cerebrate

usage: decide by reasoning; draw or come to a conclusion; "We reasoned that it was cheaper to rent than to buy a house"

2. argue, reason, present, represent, lay out

usage: present reasons and arguments

3. reason, think, cogitate, cerebrate

usage: think logically; "The children must learn to reason"

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See also: reason (Dictionary)