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

Moby Thesaurus II by Grady Ward, 1.0:

155 Moby Thesaurus words for "squire":
   Brahman, Casanova, Don Juan, Ganymede, Hebe, Lothario, Romeo,
   accompany, address, airline hostess, airline stewardess, amoroso,
   archduke, aristocrat, armiger, attend, attendant, baron, baronet,
   batman, beau, bellboy, bellhop, bellman, beneficiary, blue blood,
   bodyguard, bootblack, boots, boyfriend, caballero, cabin boy,
   caddie, cavalier, cavaliere servente, cestui, cestui que trust,
   cestui que use, chaperon, chase, chore boy, companion, conduct,
   conductor, convoy, copyboy, count, court, cupbearer, daimio,
   deedholder, duenna, duke, earl, errand boy, errand girl, escort,
   esquire, fellow, fellow traveler, feoffee, feudatory, flame,
   follow, footboy, gallant, gentleman, gigolo, go with, gofer,
   grand duke, grandee, guard, guide, hidalgo, hostess, householder,
   inamorato, lace-curtain, lady-killer, laird, landgrave, landholder,
   landlady, landlord, landowner, lay siege to, lead, lord, lordling,
   love-maker, magnate, magnifico, make suit to, man, margrave,
   marquis, marshal, master, mesne, mesne lord, mistress, necker,
   noble, nobleman, office boy, office girl, old man, optimate,
   orderly, owner, page, palsgrave, patrician, pay attention to,
   pay court to, peer, petter, philanderer, proprietary, proprietor,
   proprietress, proprietrix, pursue, rentier, safe-conduct, seducer,
   seigneur, seignior, serenade, sheik, shepherd, silk-stocking,
   spark, steward, stewardess, sue, sugar daddy, swain, sweetheart,
   swell, take, take out, tender, thoroughbred, titleholder,
   trainbearer, upper-cruster, usher, viscount, wait on, waldgrave,
   woo, yeoman, young man