I. don 1 /dɒn $ dɑːn/ BrE AmE noun [countable]
[ Date: 1900-2000 ; Language: Italian ; Origin: a respectful name, from Latin dominus 'lord' ]
1 . British English a university teacher, especially one who teaches at the universities of Oxford or Cambridge
2 . informal the leader of a Mafia organization
II. don 2 BrE AmE verb ( past tense and past participle donned , present participle donning ) [transitive] literary
[ Date: 1300-1400 ; Origin: do on 'to put on' (10-17 centuries) ]
to put on a hat, coat etc