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Is Singular ‘They’ a Better Choice? Learn a new word every day. Also found in: Thesaurus, Medical, Legal, Financial, Idioms, Wikipedia. To adopt or accept as a member, subordinate associate, or branch: The HMO affiliated the clinics last year. To become closely connected or associated: The two unions voted to affiliate. A person, organization, or establishment associated with another as a subordinate, subsidiary, or member: network affiliates.