inversion
in.ver.sion \in-'v*r-zh*n, -sh*n\ n 1: the act or process of inverting 2: a reversal of position, order, or relationship : as 2a: a change in normal word order; esp : the placement of a verb be fore its subject 2b: the process or result of changing or reversing the relative positions o f the elements of an interval, chord, or phrase (as by repeating a phrase with its intervals in the contrary order) 3: HOMOSEXUALITY 4: a conversion of a substance showing dextrorotation into one showing levo rotation or vice versa 5: a conversion of direct current into alternating current 6: increase of temperature of the air with increasing altitude
Webster's English Dictionary