a change, usually a slight change, in the appearance,character, or structure of something
Several police officers are being questioned about the alteration of the documents.
The house needed extensive alterations when we moved in.
Some alterations to our original plans might be necessary.
The tailor made a minor alteration to the dress, adjusting the waistline to provide a better fit.
The historical document had undergone several alterations over the centuries, which made it challenging to determine its original content.
