mid-13c., "in good condition, healthy," probably originally "in season, timely, opportune, excellent" (though this sense is not attested until mid-14c.), from tide (n.) in the sense of "season, time" + -y (2). Of persons, "of neat and orderly habits," from 1706. Similar formation in Old High German zitig, German zeitig, Dutch tijdig, Danish tidig "timely," Old English tidlic "temporal," also "timely, seasonable."
<a href="https://www.etymonline.com/word/titivate">Etymology of titivate by etymonline</a>
Harper, D. (n.d.). Etymology of titivate. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/titivate