affiliate

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To adopt or accept as a member, subordinate associate, or branch.
• intransitive verb To associate (oneself) as a subordinate, subsidiary, employee, or member.
• intransitive verb To assign the origin of.
• intransitive verb To become closely connected or associated.
• noun A person, organization, or establishment associated with another as a subordinate, subsidiary, or member.

from The Century Dictionary.

• To adopt; receive into a family as a son or daughter; hence, to bring into intimate association or close connection.
• In law, to fix the paternity of, as a bastard child: with upon: as, the mother affiliated her child upon John Doe.
• To connect in the way of descent or derivation: with upon.
• To associate; receive or establish on terms of fellowship.
• To associate; consort; be intimately united in action or interest.
• Occupying the position of or recognized as an adopted son; affiliated.
• noun An affiliated person or institution, etc.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To adopt; to receive into a family as a son; hence, to bring or receive into close connection; to ally.
• transitive verb To fix the paternity of; -- said of an illegitimate child.
• transitive verb To connect in the way of descent; to trace origin to.
• transitive verb 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.
• transitive verb societies connected with a central society, or with each other.
• intransitive verb To connect or associate one's self; -- followed by with.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Someone or something that is affiliated, or associated; a member of a group of associated things.
• verb transitive To adopt; to receive into a family as a son; hence, to bring or receive into close connection; to ally.
• verb transitive 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.
• verb transitive To connect in the way of descent; to trace origin to.
• verb intransitive 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a subordinate or subsidiary associate; a person who is affiliated with another or with an organization
• verb keep company with; hang out with
• verb join in an affiliation
• noun a subsidiary or subordinate organization that is affiliated with another organization