a statement acknowledging something or someone; "she must have seen him but she gave no sign of acknowledgment"; "the preface contained an acknowledgment of those who had helped her"
at or near or toward the stern of a ship or tail of an airplane; "stow the luggage aft"; "ships with square sails sail fairly efficiently with the wind abaft"; "the captain looked astern to see what the fuss was about"
the act of rejecting something; "his proposals were met with rejection"
the speech act of rejecting
(medicine) an immunological response that refuses to accept substances or organisms that are recognized as foreign; "rejection of the transplanted liver"