From The Collaborative International Dictionary of English v.0.48:
Squire \Squire\ (skw[imac]r), n. [OF. esquierre, F. ['e]querre. See Square, n.] A square; a measure; a rule. [Obs.] "With golden squire." --Spenser. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Squire \Squire\, n. [Aphetic form of esquire.] 1. A shield-bearer or armor-bearer who attended a knight. [1913 Webster]
2. A title of dignity next in degree below knight, and above gentleman. See Esquire. [Eng.] "His privy knights and squires." --Chaucer. [1913 Webster]
3. A male attendant on a great personage; also (Colloq.), a devoted attendant or follower of a lady; a beau. [1913 Webster]
4. A title of office and courtesy. See under Esquire. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Squire \Squire\, v. t. [imp. & p. p. squired (skw[imac]rd); p. pr. & vb. n. squiring.] 1. To attend as a squire. --Chaucer. [1913 Webster]
2. To attend as a beau, or gallant, for aid and protection; as, to squire a lady. [Colloq.] --Goldsmith. [1913 Webster]