Webster's English Dictionary

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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