1. changes made to something, especially to clothing to make it fit better
Usage: often used in the context of tailoring
2. modifications or changes made to a building or structure
Usage: construction context

Examples

• The dress needed several alterations before the wedding.
• She took her pants to the tailor for alterations.
• The building alterations will take three months to complete.
• Minor alterations to the design improved its functionality.
• The alterations to the kitchen made it more spacious.
• He specializes in clothing alterations and repairs.
• The architect proposed several alterations to the original plan.