n.
1.an event in which something is displaced without rotation
2.act of taking the place of another especially using underhanded tactics
3.the act of uniform movement
4.(chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound
5.(psychiatry) a defense mechanism that transfers affect or reaction from the original object to some more acceptable one
6.to move something from its natural environment
7.act of removing from office or employment