From Middle Englishreferren, from Old Frenchreferer, from Latinreferre.
Full definition of refer
Verb
(transitive) To direct the attention of.The shop assistant referred me to the help desk on ground floor.
(transitive) To submit to (another person or group) for consideration; to send or direct elsewhere.He referred the matter to the principal.to refer a patient to a psychiatrist
(transitive) To place in or under by a mental or rational process; to assign to, as a class, a cause, source, a motive, reason, or ground of explanation.He referred the phenomena to electrical disturbances.