alteration
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.”
“Among the most frequent effects are blurred vision , the appearance of a central dark spot or blind spot (scotoma), distorted perception of straight lines, known as metamorphopsia , and alterations in colour perception.”
“The finding is odd because these magnesium-rich phyllosilicates indicate extensive alteration caused by liquid water.”
From Old French alteracion (French altération), from Medieval Latin alterātiō. Morphologically alter + -ation.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.