The Collaborative International Dictionary of English v.0.48:

Pregnant \Preg"nant\, a. [F. prenant taking. Cf. Pregnable.]
   Affording entrance; receptive; yielding; willing; open;
   prompt. [Obs.] " Pregnant to good pity." --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pregnant \Preg"nant\, a. [L. praegnans, -antis; prae before +
   genere, gignere, to beget: cf. F. pr['e]gnant. See Gender,
   2d Kin.]
   [1913 Webster]
   1. Being with young, as a female; having conceived; great
      with young; breeding; teeming; gravid; preparing to bring
      forth.
      [1913 Webster]

   2. Heavy with important contents, significance, or issue;
      full of consequence or results; weighty; as, pregnant
      replies. " A pregnant argument." --Prynne. " A pregnant
      brevity." --E. Everett.
      [1913 Webster]

   3. Full of promise; abounding in ability, resources, etc.;
      as, a pregnant youth. [Obs.] --Evelyn.
      [1913 Webster]

            Wherein the pregnant enemy does much. --Shak.
      [1913 Webster]

   Pregnant construction (Rhet.), one in which more is implied
      than is said; as, the beasts trembled forth from their
      dens, that is, came forth trembling with fright.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pregnant \Preg"nant\, n.
   A pregnant woman. [R.] --Dunglison.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pregnant
    adj 1: carrying developing offspring within the body or being
           about to produce new life [ant: nonpregnant]
    2: rich in significance or implication; "a meaning look" [syn:
       meaning(a), pregnant, significant]
    3: filled with or attended with; "words fraught with meaning";
       "an incident fraught with danger"; "a silence pregnant with
       suspense" [syn: fraught(p), pregnant]

Moby Thesaurus II by Grady Ward, 1.0:

170 Moby Thesaurus words for "pregnant":
   abecedarian, aboriginal, abounding, abundant, allegorical,
   antenatal, anticipating, associational, autochthonous, basal,
   basic, beginning, big, big with child, big-laden, blooming,
   bountiful, breeding, budding, bursting, bursting out, carrying,
   carrying a fetus, central, charged, climacteric, conceptive,
   conceptual, connotational, connotative, consequential, copious,
   creative, critical, crucial, decisive, definable, denotational,
   denotative, elemental, elementary, eloquent, embryonic, emergent,
   esemplastic, exigent, expectant, expecting, expressive, extended,
   extensional, exuberant, facund, fecund, fertile, fetal, figurative,
   flourishing, formative, foundational, fraught, fructiferous,
   fruitful, full of meaning, full of point, full of substance,
   fundamental, generative, generous, genetic, germinal, gestating,
   gestatory, gone, gravid, great, heavy, heavy with child,
   ideational, ideative, imaginative, important, in embryo,
   in its infancy, in ovo, in the bud, inaugural, inceptive, inchoate,
   inchoative, incipient, incunabular, indicative, infant, infantile,
   ingenious, initial, initiative, initiatory, inspired, intelligible,
   intensional, interpretable, introductory, inventive, kairotic,
   knocked up, loaded, lush, luxuriant, meaning, meaningful, meaty,
   metaphorical, momentous, nascent, natal, notional, original,
   originative, parturient, pithy, pivotal, plenteous, plentiful,
   pointed, postnatal, preggers, prenatal, primal, primary, prime,
   primeval, primitive, primogenial, primordial, pristine,
   procreative, productive, proliferous, prolific, protogenic,
   radical, readable, referential, replete, rich, rudimental,
   rudimentary, seminal, sententious, shaping, significant,
   significative, substantial, suggestive, superabundant, superfetate,
   superimpregnated, swarming, symbolic, teeming, thriving,
   transferred, uberous, up the spout, ur, visioned, weighty,
   with child



Bouvier's Law Dictionary, Revised 6th Ed (1856):

PREGNANT, pleading. A fulness in the pleadings which admits or involves a
matter which is favorable to the opposite party. 2. It is either an
affirmative pregnant, or negative pregnant. See Affirmative pregnant;
Negative pregnant.