Source : Webster's Revised Unabridged Dictionary (1913)

Kinship \Kin"ship\, n.
   Family relationship.

Source : WordNet®

kinship
     n 1: a close connection marked by community of interests or
          similarity in nature or character; "found a natural
          affinity with the immigrants"; "felt a deep kinship with
          the other students"; "anthropology's kinship with the
          humanities" [syn: {affinity}]
     2: state of relatedness or connection by blood or marriage or
        adoption [syn: {family relationship}, {relationship}]