motion (n.) 4
cause, prompting, provocation
Cor II.i.48 [Menenius to Brutus and Sicinius, of himself] hasty and tinder-like upon too trivial motion
Cym II.iv.172 [Posthumus alone] there's no motion / That tends to vice in man, but I affirm / It is the woman's part
H8 I.i.153 [Buckingham to Norfolk, of Wolsey] Whom from the flow of gall I name not, but / From sincere motions