<p><strong>Verb (used with object)</strong></p><ul><li>to turn upside down</li><li>to reverse in position, order, direction, or relationship</li><li>to turn or change to the opposite or contrary, as in nature, bearing, or effect: to invert a process</li><li>to turn inward or back upon itself</li><li>to turn inside out</li><li>Chemistry: to subject to a reaction in which a starting material of one optical configuration forms a product of the opposite configuration</li><li>Music: to subject to musical inversion, the transposition between the upper voice part and the lower</li><li>Phonetics: to articulate as a retroflex vowel</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>Chemistry: to undergo a reaction in which a starting material of one optical configuration forms a product of the opposite configuration</li></ul><p><strong>Adjective</strong></p><ul><li>Chemistry: subjected to a reaction in which a starting material of one optical configuration forms a product of the opposite configuration</li></ul><p><strong>Noun</strong></p><ul><li>a person or thing that is reversed in position, changed to the contrary, or turned upside down, inside out, or inward</li><li>(in plumbing) that portion of the interior of a drain or sewer pipe where the liquid is deepest</li><li>a U-shaped arch or vault, having the opposite vertical orientation compared to a traditional arch or vault</li><li>Philately: a two-colored postage stamp with all or part of the central design printed upside down in relation to the inscription</li><li>Psychiatry: (no longer in technical use) a gay person</li><li>a person whose behavior is considered nonnormative for their assigned sex, historically involving both gender non-conforming or transgender expression and gay or lesbian sexual orientation</li><li>Disparaging and Offensive: anyone whose sexuality or gender expression is regarded as strange or unnatural, especially a gay or transgender person</li><li>Informal: (especially among aquarists) invertebrate: My invert tank is mostly sea slugs, but I bought a couple of shrimp recently also</li></ul>