The Collaborative International Dictionary of English v.0.48:

Connate \Con"nate\ (?; 277), a. [L. connatus; con- + natus born,
   p. p. of nasci. See Cognate.]
   [1913 Webster]
   1. Born with another; being of the same birth.
      [1913 Webster]

   2. Congenital; existing from birth. "Connate notions."
      --South.
      [1913 Webster]

            A difference has been made by some; those diseases
            or conditions which are dependent on original
            conformation being called congenital; while the
            diseases of affections that may have supervened
            during gestation or delivery are called connate.
                                                  --Dunglison.
      [1913 Webster]

   3. (Bot.) Congenitally united; growing from one base, or
      united at their bases; united into one body; as, connate
      leaves or athers. See Illust. of Connate-perfoliate.
      [1913 Webster]

WordNet (r) 3.0 (2006):

connate
    adj 1: of similar parts or organs; closely joined or united; "a
           connate tomato flower" [ant: adnate]
    2: related in nature; "connate qualities" [syn: connate,
       cognate]