alteration
n. countable B2 Upper Intermediate US //ˌɔɫtɝˈeɪʃən// UK //ˌɒltəɹˈeɪʃən// al·ter·ation
n. a small change to something, such as clothes or a plan. You use this when you modify an existing thing rather than replacing it completely.
n. a minor modification or adjustment to an existing object, plan, or state. Often implies a change in form or appearance rather than a complete replacement.
The tailor made a small alteration to the jacket.
She requested an alteration to the contract before signing the final agreement.
The building underwent significant alteration during the renovation, blending modern glass elements with the original stone façade.
From Old French alteracion (French altération), from Medieval Latin alterātiō. Morphologically alter + -ation.