/ ˈskwaɪə(r); NAmE / noun
1.
(also Squire ) (in the past in England) a man of high social status who owned most of the land in a particular country area
2.
Squire ( BrE , informal or humorous ) used by a man as a friendly way of addressing another man :
What can I get you, Squire?
3.
(in the past) a young man who was an assistant to a knight before becoming a knight himself
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WORD ORIGIN
Middle English (in sense 3): shortening of Old French esquier esquire.