Source : Webster's Revised Unabridged Dictionary (1913)

Affiliation \Af*fil`i*a"tion\, n. [F. affiliation, LL.
   affiliatio.]
   1. Adoption; association or reception as a member in or of
      the same family or society.

   2. (Law) The establishment or ascertaining of parentage; the
      assignment of a child, as a bastard, to its father;
      filiation.

   3. Connection in the way of descent. --H. Spencer.

Source : WordNet®

affiliation
     n 1: a social or business relationship; "a valuable financial
          affiliation"; "he was sorry he had to sever his ties
          with other members of the team"; "many close
          associations with England" [syn: {association}, {tie}, {tie-up}]
     2: the act of becoming formally connected or joined; "welcomed
        the affiliation of the research center with the
        university"