Main Entry: ¹mis·ter

Pronunciation: \ˈmis-tər, for 1 ˌmis-tər or in rapid speech (ˌ)mis(t)\

Function: noun

Etymology: alteration of ¹master

Date: 1551

1 capitalized : mr. —used sometimes in writing instead of Mr.
2 : sir —used without a name as a generalized term of direct address of a man who is a stranger <hey, mister, do you want to buy a paper>
3 : a man not entitled to a title of rank or an honorific or professional title <though he was only a mister, he was a greater scholar in his field than any PhD>
4 : husband