Longman Dictionary of Contemporary English homepage

alteration

 noun
     
al‧ter‧a‧tion [uncountable and countable]
a small change that makes someone or something slightly different, or the process of this change
alteration to
If you make alterations to the Windows setup, save the new settings before closing.
alteration in
Have you noticed any alteration in the patient's behaviour?
minor/major etc alterations
The King's Arms pub is to undergo extensive alterations.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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