The Collaborative International Dictionary of English v.0.48:

Natal \Na"tal\ (n[=a]"tal), a. [L. natalis, fr. natus, p. p. of
   nasci to be born: cf. F. natal. See Nation, and cf.
   Noel.]
   1. Of or pertaining to one's birth; accompying or dating from
      one's birth; native.
      [1913 Webster]

            Princes' children took names from their natal
            places.                               --Camden.
      [1913 Webster]

            Propitious star, whose sacred power
            Presided o'er the monarch's natal hour. --Prior.
      [1913 Webster]

   2. (Astrol.) Presiding over nativity; as, natal Jove.
      [1913 Webster]

   Syn: Native, natural. See Native.
        [1913 Webster]

WordNet (r) 3.0 (2006):

natal
    adj 1: relating to or accompanying birth; "natal injuries";
           "natal day"; "natal influences"
    2: of or relating to the buttocks
    n 1: a region of eastern South Africa on the Indian Ocean;
         "Natal was renamed KwaZulu-Natal in 1994" [syn: Natal,
         KwaZulu-Natal]
    2: a port city in northeastern Brazil

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "natal":
   abecedarian, aboriginal, antenatal, autochthonous, beginning,
   budding, creative, elemental, elementary, embryonic, endemic,
   fetal, formative, foundational, fundamental, gestatory, homebred,
   homegrown, in embryo, in its infancy, in the bud, inaugural,
   inceptive, inchoate, inchoative, incipient, incunabular,
   indigenous, infant, infantile, initial, initiative, initiatory,
   introductory, inventive, nascent, native, native-born, original,
   parturient, postnatal, pregnant, prenatal, primal, primary, prime,
   primeval, primitive, primogenial, procreative, rudimental,
   rudimentary, ur, vernacular



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

NATALE. The state of condition of a man acquired by birth.