/ ˈɔːltə(r); NAmE / verb
1.
to become different; to make sb/sth different :
[ v ]
Prices did not alter significantly during 2004.
He had altered so much I scarcely recognized him.
[ vn ]
It doesn't alter the way I feel.
Nothing can alter the fact that we are to blame.
The landscape has been radically altered, severely damaging wildlife.
2.
[ vn ] to make changes to a piece of clothing so that it will fit you better
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WORD ORIGIN
late Middle English : from Old French alterer , from late Latin alterare , from Latin alter other.