[1] : The Collaborative International Dictionary of English v.0.48

dozen \doz"en\ du^z"'n, n.; pl. dozen before another
   noun, dozens du^z"'nz. oe. doseine, dosein, of.
   doseine, f. douzaine, fr. douze twelve, fr. l. duodecim; duo
   two + decem ten. see two, ten, and cf. duodecimal.
   1. a collection of twelve objects; a tale or set of twelve;
      with or without of before the substantive which follows.
      "some six or seven dozen of scots." "a dozen of shirts to
      your back." "a dozen sons." "half a dozen friends."
      --shak.
      1913 webster

   2. an indefinite small number. --milton.
      1913 webster

   a baker's dozen, thirteen; -- called also a long dozen.
      1913 webster
see also:
dozen dozens two ten duodecimal a baker's dozen 
long dozen 

[2] : WordNet (r) 2.0

dozen
     adj : denoting a quantity consisting of 12 items or units syn: twelve,
            12, xii
     n : the cardinal number that is the sum of eleven and one syn:
         twelve, 12, xii
see also:
twelve 12 xii xii 

[3] : Moby Thesaurus II by Grady Ward, 1.0

51 moby thesaurus words for "dozen":
   l, sexagesima, boxcar, boxcars, duodecimo, eighty, eleven, fifteen,
   fifty, five and twenty, fortnight, forty, four and twenty,
   fourscore, fourscore and ten, fourteen, half a hundred, long dozen,
   ninety, nonagenarian, octogenarian, quindecennial, quindecim,
   quindecima, quindene, score, septuagenarian, seventy, sexagenarian,
   sexagenary, sexagesimo-quarto, sixteen, sixteenmo, sixty,
   sixty-four, sixty-fourmo, teens, thirteen, thirty-two,
   thirty-twomo, threescore, threescore and ten, twelve, twelvemo,
   twenty, twenty-five, twenty-four, twenty-fourmo, two dozen,
   two weeks, twoscore

Dozen >> D Words
Dozen, definition of term: Dozen
dozen_pag1.html

Bakers Dozen >> B Words
Bakers Dozen, definition of term: Bakers Dozen
bakers+dozen_pag1.html