mid-15c., intuicioun, "insight, direct or immediate cognition, spiritual perception," originally theological, from Late Latin intuitionem (nominative intuitio) "a looking at, consideration," noun of action from past participle stem of Latin intueri "look at, consider," from in- "at, on" (from PIE root *en "in") + tueri "to look at, watch over" (see tutor (n.)).
he had an intuition that something had gone wrong
intrusion
intrusive
intrust
intubate
intuit
intuition
intuitive
intumescence
intumescent
inturn
inturned