As a Noun: 1. A change from one thing to another thing, especially its opposite. English = switch, changeover, conversion, inversion. 2. A change back to something else that was the case before. English = reversion. 3. In mathematics, a reciprocal quantity, mathematical expression, geometric figure, etc. which is the result of inversion. English = inverse. As a Verb or Adjective: 1. To change from one thing to another thing, especially its opposite. English = switch, changeover, convert, invert. 2. To change or be changed from one thing to another thing, especially its opposite in direction or orientation, so that it faces in the opposite direction. English = invert, turn upside down; (be) inverted, (be) upside down. 3. To change back to something else that was the case before. English = revert.