A postposition is an adposition that occurs after its complement.
Japanese
In the following sentence, the words and oga, ni, are postpositions:
Kuno, Susumu. 1973.The structure of the Japanese language. Cambridge, MA: Massachusetts Institute of Technology.
Hartmann, R.R.K., and F.C. Stork. 1972.Dictionary of language and linguistics. London: Applied Science.
Crystal, David. 1980.A first dictionary of linguistics and phonetics. Boulder, CO: Westview.