to refuse to have, take, recognize, etc.: to reject the offer of a better job.
to refuse to grant (a request, demand, etc.).
to refuse to accept (someone or something); rebuff: The other children rejected him. The publisher rejected the author's latest novel.
to discard as useless or unsatisfactory: The mind rejects painful memories.
to cast out or eject; vomit.
to cast out or off.
(of a human or other animal) to have an immunological reaction against (a transplanted organ or grafted tissue): If tissue types are not matched properly, a patient undergoing a transplant will reject the graft.