or '''Inversion''' may refer to:
- Inverse (mathematics)
- Inversion (geometry) , a particular type of conformal mapping
- Inverse Problem , in science and mathematics, fitting a model to known data
- Inversion (geology) , the relative uplift of a previously basinal area resulting from local shortening, in structural geology
- Inversion (meteorology) , air temperature increasing with height
- Inversion (nuclear) , The "island of inversion", a group of elements with abnormal nuclear shell structure
- Chromosomal Inversion , where a segment of a chromosome is reversed end to end
- Nitrogen Inversion , a chemical process in which a trigonal nitrogen-containing structure turns inside-out
- Population Inversion , in statistical mechanics, when a system exists in state with more members in an excited state than in lower energy states
- Sexual Inversion , in biology, the switching from one sex to the opposite among some animal species.
- Sexual Inversion (sexology) , a term for reversal of gender roles, usually implying homosexuality, found primarily in older scientific literature
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