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Meaning:
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something that encourages (a person to do something, an activity etc); something, e.g. light, heat, electricity that causes an animal or plant to do something

provocation

catalyst encouragement fillip impetus incentive motivation stimulant stimulation bang boost cause charge fireworks flash goad impulse incitation incitement inducement instigation invitation kick motive propellant push spur sting turn-on urging eye-opener piquing shot in the arm
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Cases of word usage

1) an encouragement or stimulus (fillip)

STIMULUS as in Wiktionary
STIMULUS as in Wikipedia