stimulus

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