1640s, from Medieval Latin intimidatus, past participle of intimidare "to frighten, make afraid," from in- "in" (from PIE root *en "in") + Latin timidus "fearful" (see timid). Related: Intimidated; intimidating. The French verb was intimider (16c.).
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Definitions of intimidation from WordNet
the act of intimidating a weaker person to make them do something;