noun
alteration
awl-tuh-RAY-shuhn/ˌɔːltəˈreɪʃn/
A change to something or the act of changing it.
The alteration shortens the dress, leaving a neatly finished hem.

Etymology
Latin alter, “the other,” supplied a verb meaning “to change.” With the noun ending, alteration names the act of making something different or the change produced.
In context
the display of that particular coat we therefore find Cadets bearing the arms of their house with the tincture changed with subsid iary charges introduced or with some similar radical alteration made
More examples
- The plans require no further alteration.
- Several alterations improve access to the old building.
- She notices an unexpected alteration in his usual routine.
Forms
alteration · alterations
alter verb — To make or become different.
Similar words
- modification
- Often suggests a deliberate change serving a particular purpose.
- revision
- Usually concerns reworking text, plans, or earlier judgments.