An Etymological Dictionary of Astronomy and Astrophysics

To provoke, urge, or incite.

Etymology (EN): From L. instigatus, p.p. of instigare “to urge on, incite,” from → in- “in” + *stigare
“to prick,” from PIE root *steig- “to prick, stick, pierce,” cognate with Pers. tig, tiz, → sharp.

Etymology (PE): Âqâlidan “to excite, rouse.”