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1670s, noun of action from past participle stem of Latin introspicere "to look into, look at," from intro- "inward" (see intro-) + specere "to look at" (see scope (n.1)).
1680s, from Latin introspectus, past participle of introspicere "look at, look into" (see introspection). Related: Introspected; introspecting.
introspection in·tro·spec·tion (ĭn'trə-spěk'shən)n. Contemplation of one's own thoughts, feelings, and sensations; self-examination.