1. [n]  any of numerous varieties of small to medium-sized round or oval smooth-skinned fruit with a single pit
2. [n]  any of several trees producing edible oval smooth-skinned fruit with a single hard stone
3. [adv]  (slang) completely; used as intensifiers; "clean forgot the appointment"; "I'm plumb (or plum) tuckered out"
4. [adv]  (informal) exactly; "fell plumb in the middle of the puddle"

Plum
This collection of poetry for children features verses about such things as mermaids, fleas, and a place known as Mrs. Rummage`s Muddle-Up Shop. Pastel illustrations accompany the text.

more details ...

1. \Plum\, n.
   Something likened to a plum in desirableness; a good or
   choice thing of its kind, as among appointments, positions,
   parts of a book, etc.
   

2. \Plum\, n. [AS. pl[=u]me, fr. L. prunum; akin to Gr. ?, ?.
   Cf. {Prune} a dried plum.]
   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}.
            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.
   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.
   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. Among plants called plum, but of other
      genera than {Prunus}, are;
   {Australian plum}, {Cargillia arborea} and {C. 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}.
   2. A grape dried in the sun; a raisin.
   3. A handsome fortune or property; formerly, in cant
      language, the sum of [pounds]100,000 sterling; also, the
      person possessing it.
   {Plum bird}, {Plum budder} (Zo["o]l.), the European
      bullfinch.
   {Plum gouger} (Zo["o]l.), 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} (Zo["o]l.), 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}.
   

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].