don1
  
  n.
  - Brit. a university teacher, especially a senior member of a college at Oxford or Cambridge.
 - 
(Don)
 a Spanish title prefixed to a male forename. 
▸N. Amer. informal a high-ranking member of the Mafia.
 
 
  Etymology
  C16: from Sp., from L. dominus ‘lord, master’.
 
  
    
don2
  
  v.
 (dons, donning, donned)
 put on (an item of clothing).
 
  Etymology
  ME: contr. of do on; cf. doff.