Main Entry: re·jec·tion

Pronunciation: \ri-ˈjek-shən\

Function: noun

1 : the action of rejecting or the state of being rejected <feelings of rejection> <rejection of the atypical child by the…group—G. S. Speer>
2 : an immune response in which foreign tissue (as of a skin graft or transplanted organ) is attacked by immune system components (as antibodies, T cells, and macrophages) of the recipient organism