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]

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]

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]

WordNet (r) 3.0 (2006):

squire
    n 1: young nobleman attendant on a knight
    2: an English country landowner
    3: a man who attends or escorts a woman [syn: squire,
       gallant]
    v 1: attend upon as a squire; serve as a squire