don

Etymology 1

From Latin dominus (“lord, head of household”), akin to Italian don, Sicilian don, Spanish don; from domus (“house”). Doublet of dom, domine, dominie, and dominus.

noun

1. A university professor, particularly one at Oxford or Cambridge.
2. An employee of a university residence who lives among the student residents.
3. A mafia boss.
4. (MLE) Any man, bloke, dude.
   I’m confused like who’s this don .22 bells and that who’s on 2017-10-31, Loski (lyrics and music), “Olympic Chinging”, from 1:55

Etymology 2

From Middle English don (“to put on”), from Old English dōn on. Compare also doff, dup, dout.

verb

1. (transitive) To put on clothing; to dress (oneself) in an article of personal attire.
   To don one's clothes.
   Now when he had reached the King's capital wherein was Alaeddin, he alighted at one of the Kháns; and, when he had rested from the weariness of wayfare, he donned his dress and went down to wander about the streets, where he never passed a group without hearing them prate about the pavilion and its grandeur and vaunt the beauty of Alaeddin and his lovesomeness, his liberality and generosity, his fine manners and his good morals. 1886-88, Richard Francis Burton, The Supplemental Nights to the Thousand Nights and a Night
   Having donned our PPE, we walk through the site to the prefab that controls access to the tunnel. March 23 2022, Paul Bigland, “HS2 is just 'passing through'”, in RAIL, number 953, page 41