inversion

1. The action of inverting. (countable, uncountable)
2. The act of being in an inverted state; being upside down, inside out, or in a reverse sequence. (countable, uncountable)
3. The reversal of an interval; the move of one pitch in an interval up or down an octave. (countable, uncountable)
4. The position of a chord which has a note other than the root as its bass note. (countable, uncountable)
5. The flipping of a melody or contrapuntal line so that high notes become low and vice versa; the reversal of a pitch contour. (countable, uncountable)
6. A segment of DNA in the context of a chromosome that is reversed in orientation relative to a reference karyotype or genome. (countable, uncountable)
7. A situation where air temperature increases with altitude (the ground being colder than the surrounding air). (countable, uncountable)
8. A section of a roller coaster where passengers are temporarily turned upside down. (countable, uncountable)

Plural inversions