The Collaborative International Dictionary of English v.0.48:

Squad \Squad\ (skw[o^]d), n. [F. escouade, fr. Sp. escuadra, or
   It. squadra, (assumed) LL. exquadrare to square; L. ex +
   quadra a square. See Square.]
   1. (Mil.) A small party of men assembled for drill,
      inspection, or other purposes.
      [1913 Webster]

   2. Hence, any small party.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Squad \Squad\, n.
   Sloppy mud. [Prov. Eng.] --Tennyson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

squad
    n 1: a smallest army unit
    2: a cooperative unit (especially in sports) [syn: team,
       squad]
    3: a small squad of policemen trained to deal with a particular
       kind of crime [syn: police squad, squad]

Moby Thesaurus II by Grady Ward, 1.0:

88 Moby Thesaurus words for "squad":
   KP, age group, army, army group, band, battalion, battery,
   battle group, bevy, body, brigade, bunch, cabal, cadre, cast,
   clique, cohort, column, combat command, combat team, company,
   complement, contingent, corps, coterie, covey, crew, crowd,
   detachment, detail, division, eight, eleven, faction, field army,
   field train, file, first string, first team, five, fleet,
   flying column, force, gang, garrison, group, grouping, groupment,
   in-group, junta, kitchen police, legion, maniple, mob, movement,
   nine, organization, out-group, outfit, pack, party, peer group,
   phalanx, platoon, posse, rank, regiment, reserves, rowing crew,
   salon, second string, second team, section, set, squadron, stable,
   string, tactical unit, task force, team, third string, train,
   tribe, troop, troupe, unit, varsity, wing