Source : Webster's Revised Unabridged Dictionary (1913)

Retail \Re"tail\, a.
   Done at retail; engaged in retailing commodities; as a retail
   trade; a retail grocer.

Retail \Re*tail"\, v. t. [imp. & p. p. {Retailed};p. pr. & vb.
   n. {Retailing}.] [Cf. F. retailler to cut again; pref. re- re
   + tailler to cut. See {Retail}, n., {Tailor}, and cf.
   {Detail}.]
   1. To sell in small quantities, as by the single yard, pound,
      gallon, etc.; to sell directly to the consumer; as, to
      retail cloth or groceries.

   2. To sell at second hand. [Obs. or R.] --Pope.

   3. To distribute in small portions or at second hand; to tell
      again or to many (what has been told or done); to report;
      as, to retail slander. ``To whom I will retail my conquest
      won.'' --Shak.

            He is wit's peddler, and retails his wares At wakes
            and wassails.                         --Shak.

Retail \Re"tail\, n. [F. retaille piece cut off, shred, paring,
   or OF. retail, from retailler. See {Retail}, v.]
   The sale of commodities in small quantities or parcels; --
   opposed to wholesale; sometimes, the sale of commodities at
   second hand.

Source : WordNet®

retail
     adj : selling or related to selling direct to the consumer;
           "retail trade"; "retail business"; "retail price" [ant:
            {wholesale}]

retail
     n : the selling of goods to consumers; usually in small
         quantities and not for resale [ant: {wholesale}]

retail
     adv : at a retail price; "I'll sell it to you retail only" [ant: {wholesale}]

retail
     v 1: be sold at the retail level; "These gems retail at thousands
          of dollars each"
     2: sell on the retail market [ant: {wholesale}]