1. the act or process of changing something
2. a change made to something, especially to clothing to improve the fit

Examples

• The alteration of the building’s design required new permits.
• She made several alterations to the original plan.
• The dress needs alterations before the wedding.
• Minor alterations to the schedule were announced.
• The tailor completed the alterations in two days.
• Climate change involves alterations in weather patterns.
• The contract underwent significant alterations before signing.