Rejection, or the verb reject, may refer to: Social rejection, in psychology, an interpersonal situation that occurs when a person or group of people exclude an individual from a social relationship Transplant rejection, in medicine, the immune reaction of a host organism to a foreign biological tissue, such as in a transplantation In telecommunications, rejection is the receiving of the desired signal without interference from another undesired one. In basketball, rejection is a slang term for a block In mathematics, the rejection of a vector a from a vector b is the component of a perpendicular to b, as opposed to its projection, which is parallel to b. In statistics, rejection of a null hypothesis in favour of an alternative hypothesis when doing a hypothesis test. In statistics, rejection sampling is a technique used to generate observations from a distribution In zoology, the shunning of one or more animals in a litter Rejection of Jesus, described in the New Testament Art, media and entertainent Reject, a song by Green Day from Nimrod The Rejection (EP) Rejection (song), song by Martin Solveig Rejection, a 2009 film with Gary Farmer Rejection (film), a 2011 Ukrainian film "Rejection", a song by AC/DC from Power Up See also Accept (disambiguation), the opposite of rejection Rejectionism (disambiguation)