What does affiliate mean?
The definition of affiliate
Af*fil”i*ate, v. t.
[imp. & p. p. Affiliated; p. pr. & vb. n.Affiliating.]
Etym: [LL. adfiliare, affiliare, to adopt as son; ad + filius son: cf. F. affilier.]

1 To adopt; to receive into a family as a son; hence, to bring or receive into close connection; to ally. Is the soul affiliated to God, or is it estranged and in rebellion I. Taylor.
2 To fix the paternity of; — said of an illegitimate child; as, to affiliate the child to (or on or upon) one man rather than another.
3 To connect in the way of descent; to trace origin to. How do these facts tend to affiliate the faculty of hearing upon the aboriginal vegetative processes H. Spencer.
4 To attach (to) or unite (with); to receive into a society as a member, and initiate into its mysteries, plans, etc.; — followed by to or with. Affiliated societies, societies connected with a central society, or with each other.

Af*fil”i*ate, v. i.
To connect or associate one’s self; — followed by with; as, they affiliate with no party.