"altering" in the noun sense
1. neutering, fixing, altering
the sterilization of an animal
"they took him to the vet for neutering"
"altering" in the verb sense
1. change, alter, modify
cause to change make different cause a transformation
"The advent of the automobile may have altered the growth pattern of the city"
"The discussion has changed my thinking about the issue"
2. change, alter, vary
become different in some particular way, without permanently losing one's or its former characteristics or essence
"her mood changes in accordance with the weather"
"The supermarket's selection of vegetables varies according to the season"
make an alteration to
"This dress needs to be altered"
4. interpolate, alter, falsify
insert words into texts, often falsifying it thereby
5. alter, neuter, spay, castrate
remove the ovaries of
"Is your cat spayed?"
Source: WordNet® (An amazing lexical database of English)
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