The Collaborative International Dictionary of English v.0.48:

Succinct \Suc*cinct"\, a. [L. succinctus, p. p. of succingere to
   gird below or from below, to tuck up; sub + cingere to gird.
   Cf. Cincture.]
   1. Girded or tucked up; bound; drawn tightly together.
      [1913 Webster]

            His habit fit for speed succinct.     --Milton.
      [1913 Webster]

   2. Compressed into a narrow compass; brief; concise.
      [1913 Webster]

            Let all your precepts be succinct and clear.
                                                  --Roscommon.
      [1913 Webster]

            The shortest and most succinct model that ever
            grasped all the needs and necessities of mankind.
                                                  --South.
      [1913 Webster]

   Syn: Short; brief; concise; summary; compendious; laconic;
        terse.
        [1913 Webster] -- Suc*cinct"ly, adv. --
        Suc*cinct"ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

succinct
    adj 1: briefly giving the gist of something; "a short and
           compendious book"; "a compact style is brief and pithy";
           "succinct comparisons"; "a summary formulation of a wide-
           ranging subject" [syn: compendious, compact,
           succinct, summary]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "succinct":
   Spartan, abbreviated, abridged, aphoristic, aposiopestic,
   axiomatic, blunt, brief, brusque, clipped, close, compact,
   compendious, compressed, concise, condensed, contracted, crisp,
   curt, curtal, curtate, cut, decurtate, docked, elliptic,
   epigrammatic, formulaic, formulistic, gnomic, instantaneous,
   laconic, little, low, pithy, platitudinous, pointed, proverbial,
   pruned, pungent, reserved, sententious, short, short and sweet,
   shortened, summary, synopsized, synoptic, taciturn, terse, tight,
   to the point, transient, truncated