Source : Webster's Revised Unabridged Dictionary (1913)

Cognate \Cog"nate\, n.
   1. (Law) One who is related to another on the female side.
      --Wharton.

   2. One of a number of things allied in origin or nature; as,
      certain letters are cognates.

Cognate \Cog"nate\, a. [L. cognatus; co- + gnatus, natus, p. p.
   of nasci, anciently gnasci, to be born. See {Nation}, and cf.
   {Connate}.]
   1. Allied by blood; kindred by birth; specifically (Law),
      related on the mother's side.

   2. Of the same or a similar nature; of the same family;
      proceeding from the same stock or root; allied; kindred;
      as, a cognate language.

Source : WordNet®

cognate
     adj 1: related in nature; "connate qualities" [syn: {connate}]
     2: having the same ancestral language; "cognate languages"
     3: related by blood [syn: {akin(p)}, {blood-related}, {consanguine},
         {consanguineous}, {kin(p)}]
     n 1: one related by blood or origin; especially on sharing an
          ancestor with another [syn: {blood relation}, {blood
          relative}, {sib}]
     2: a word is cognate with another if both derive from the same
        word in an ancestral language [syn: {cognate word}]