Entry 1 sense Webster, 1913 Instigator /ĭn'-stəg-ātˌ-ẽr/ · In·sti·ga·tor · IPA /ˈɪnstəˌɡeɪtɚ/ 01 n. One who instigates or incites. 1. One who instigates or incites. Syn. inciter, instigant.