al·ter (ôl t r)v. al·tered, al·ter·ing, al·ters v.tr. 1. To change or make different; modify: altered my will. 2. To adjust (a garment) for a better fit. 3. To castrate or spay (an animal, such as a cat or a dog). v.intr. To change or become different. [Middle English alteren, from Old French alterer, from Medieval Latin alter  re, from Latin alter, other; see al-1 in Indo-European roots.] |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  altering - the sterilization of an animal; "they took him to the vet for neutering"sterilisation, sterilization - the act of making an organism barren or infertile (unable to reproduce) castration, emasculation - neutering a male animal by removing the testicles spaying - neutering a female by removing the ovaries |
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