The Collaborative International Dictionary of English v.0.48:

Enceinte \En`ceinte"\, a. [F., fr. L. in not + cinctus, p. p. of
   cingere to gird about.]
   Pregnant; with child.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Enceinte \En`ceinte"\, n. [F., fr. enceindre to gird about,
   surround, L. incingere; in (intens). + cingere to gird. See
   Cincture.]
   1. (Fort.) The line of works which forms the main inclosure
      of a fortress or place; -- called also body of the
      place.
      [1913 Webster]

   2. The area or town inclosed by a line of fortification.
      [1913 Webster]

            The suburbs are not unfrequently larger than their
            enceinte.                             --S. W.
                                                  Williams.
      [1913 Webster]

WordNet (r) 3.0 (2006):

enceinte
    adj 1: in an advanced stage of pregnancy; "was big with child";
           "was great with child" [syn: big(p), enceinte,
           expectant, gravid, great(p), large(p),
           heavy(p), with child(p)]

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

ENCEINTE, med. jur. A French word, which signifies pregnant.
     2. When a woman is pregnant, and is convicted of a capital crime, she
cannot lawfully be punished till after her delivery.
     3. in the English law, where a widow is suspected to feign herself with
child, in order to produce a supposititious heir to the estate, the
presumptive heir may have a writ de ventre inspiciendo, to examine whether
she be with child or not. Cro. Eliz. 566; 4 Bro. C. C. 90. As to the signs
of pregnancy, see 1 Beck's Med. Jur. 157. See, generally, 4 Bl. Com. 894; 2
P. Wms. 591; 1 Cox, C. C. 297 and Pregnancy; Privement enceinte.