stimulus

stimulus

noun activator, animator, arouser, calcar, catalyst, catalytic agent, cause, drive, encouragement, fillip, goad, impetus, impulse, incentive, incitement, inducement, influence, mooivating force, motive, needle, prod, provocation, push, reason, shock, spur, stimulant, stimulation, stimulative, stimulator, sting, urge, whet

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See also: cause, impetus, incentive, inducement, instigation, motive, origination, provocation, reason