Word Source - www.word.sc/reason - Dictionary definition for reason

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reason

noun

a rational motive for a belief or action; "the reason that war was declared"; "the grounds for their declaration"
Synonyms: ground
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"
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"
Synonyms: intellect, understanding
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"
Synonyms: rationality, reasonableness
a justification for something existing or happening; "he had no cause to complain"; "they had good reason to rejoice"
Synonyms: cause, grounds
a fact that logically justifies some premise or conclusion; "there is reason to believe he is lying"

verb

decide by reasoning; draw or come to a conclusion; "We reasoned that it was cheaper to rent than to buy a house"
Synonyms: conclude, reason out
present reasons and arguments
Synonyms: argue
think logically; "The children must learn to reason"