The Collaborative International Dictionary of English v.0.48:

Plum \Plum\, n. [AS. pl[=u]me, fr. L. prunum; akin to Gr. ?, ?.
   Cf. Prune a dried plum.]
   [1913 Webster]
   1. (Bot.) The edible drupaceous fruit of the Prunus
      domestica, and of several other species of Prunus;
      also, the tree itself, usually called plum tree.
      [1913 Webster]

            The bullace, the damson, and the numerous varieties
            of plum, of our gardens, although growing into
            thornless trees, are believed to be varieties of the
            blackthorn, produced by long cultivation. --G.
                                                  Bentham.
      [1913 Webster]

   Note: Two or three hundred varieties of plums derived from
         the Prunus domestica are described; among them the
         greengage, the Orleans, the purple gage, or
         Reine Claude Violette, and the German prune, are
         some of the best known.
         [1913 Webster]

   Note: Among the true plums are;

   Beach plum, the Prunus maritima, and its crimson or
      purple globular drupes,

   Bullace plum. See Bullace.

   Chickasaw plum, the American Prunus Chicasa, and its
      round red drupes.

   Orleans plum, a dark reddish purple plum of medium size,
      much grown in England for sale in the markets.

   Wild plum of America, Prunus Americana, with red or
      yellow fruit, the original of the Iowa plum and several
      other varieties.
      [1913 Webster] Among plants called plum, but of other
      genera than Prunus, are;

   Australian plum, Cargillia arborea and Cargillia
      australis, of the same family with the persimmon.

   Blood plum, the West African H[ae]matostaphes Barteri.

   Cocoa plum, the Spanish nectarine. See under Nectarine.


   Date plum. See under Date.

   Gingerbread plum, the West African Parinarium
      macrophyllum.

   Gopher plum, the Ogeechee lime.

   Gray plum, Guinea plum. See under Guinea.

   Indian plum, several species of Flacourtia.
      [1913 Webster]

   2. A grape dried in the sun; a raisin.
      [1913 Webster]

   3. A handsome fortune or property; formerly, in cant
      language, the sum of [pounds]100,000 sterling; also, the
      person possessing it.
      [1913 Webster]

   4. Something likened to a plum in desirableness; a good or
      choice thing of its kind, as among appointments,
      positions, parts of a book, etc.; as, the mayor rewarded
      his cronies with cushy plums, requiring little work for
      handsome pay
      [Webster 1913 Suppl. +PJC]

   5. A color resembling that of a plum; a slightly grayish deep
      purple, varying somewhat in its red or blue tint.
      [PJC]

   Plum bird, Plum budder (Zool.), the European bullfinch.


   Plum gouger (Zool.), a weevil, or curculio (Coccotorus
      scutellaris), which destroys plums. It makes round holes
      in the pulp, for the reception of its eggs. The larva
      bores into the stone and eats the kernel.

   Plum weevil (Zool.), an American weevil which is very
      destructive to plums, nectarines, cherries, and many other
      stone fruits. It lays its eggs in crescent-shaped
      incisions made with its jaws. The larva lives upon the
      pulp around the stone. Called also turk, and plum
      curculio. See Illust. under Curculio.
      [1913 Webster]

WordNet (r) 3.0 (2006):

plum
    adv 1: exactly; "fell plumb in the middle of the puddle" [syn:
           plumb, plum]
    2: completely; used as intensifiers; "clean forgot the
       appointment"; "I'm plumb (or plum) tuckered out" [syn:
       clean, plumb, plum]
    n 1: any of several trees producing edible oval fruit having a
         smooth skin and a single hard stone [syn: plum, plum
         tree]
    2: any of numerous varieties of small to medium-sized round or
       oval fruit having a smooth skin and a single pit
    3: a highly desirable position or assignment; "a political plum"

Moby Thesaurus II by Grady Ward, 1.0:

116 Moby Thesaurus words for "plum":
   Mars violet, Tyrian purple, accrued dividends,
   accumulated dividends, ambition, amethyst, bawbee, boast, bonus,
   carrot, cash dividend, catch, clematis, coup, cream, crown,
   cumulative dividend, dahlia, damson, dearest wish, desideration,
   desideratum, desire, diamond, dividend, dollar, extra dividend,
   farthing, favors of office, find, fiver, florin, forbidden fruit,
   fourpence, fourpenny, fuchsia, gem, glimmering goal, godsend,
   golden vision, good thing, grape, groat, guerdon, guinea,
   half crown, half dollar, halfpenny, heliotrope, hope, hyacinth,
   imperial purple, interest, interim dividend, jewel, lavender,
   lilac, lodestone, mag, magenta, magnet, mallow, mauve, meed, meg,
   melon, mite, monkey, monsignor, mulberry, new pence, np,
   optional dividend, orchid, p, pansy, pansy violet, patronage,
   pearl, pence, penny, phony dividend, political patronage,
   pontiff purple, pony, pork, pork barrel, pound, premium, pride,
   pride and joy, prize, quid, regal purple, regular dividend,
   royal purple, shilling, sixpence, solferino, special dividend,
   stock dividend, temptation, tenner, threepence, threepenny bit,
   thrippence, treasure, trophy, trouvaille, tuppence, twopence,
   violet, windfall, wine purple, winner, wish



The Free On-line Dictionary of Computing (30 December 2018):

PLUM

   A compiler for a substantial subset of PL/I for the
   Univac 1100, from the University of Maryland.

   ["PL/I Programming with PLUM", M.V. Zelkowitz, Paladin House,
   1978].

   (1995-02-23)


U.S. Gazetteer Places (2000):

Plum, PA -- U.S. borough in Pennsylvania
   Population (2000):    26940
   Housing Units (2000): 10624
   Land area (2000):     28.628230 sq. miles (74.146772 sq. km)
   Water area (2000):    0.385414 sq. miles (0.998217 sq. km)
   Total area (2000):    29.013644 sq. miles (75.144989 sq. km)
   FIPS code:            61536
   Located within:       Pennsylvania (PA), FIPS 42
   Location:             40.494110 N, 79.754477 W
   ZIP Codes (1990):     15239
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Plum, PA
    Plum