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|Noun||1.||rational motive - a motive that can be defended by reasoning or logical argument|
motivation, motive, need - the psychological feature that arouses an organism to action toward a desired goal; the reason for the action; that which gives purpose and direction to behavior; "we did not understand his motivation"; "he acted with the best of motives"
reason, ground - a rational motive for a belief or action; "the reason that war was declared"; "the grounds for their declaration"