impulse

US /ˈɪm.pʌls/
UK /ˈɪm.pʌls/
1.

a sudden strong and unreflective urge or desire to act.

:
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I had an almost irresistible impulse to giggle
:
urgeinstinctdrivecompulsionneeditchwhimcapricedesirefancynotion
2.

a driving or motivating force; an impetus.

:
•
an added impulse to this process of renewal
:
inspirationstimulationstimulusincitementmotivationencouragementfillipspurprodcatalyst