alterations meaning

[Architecture]
1.

A construction project (or portion of a project) comprising revisions within or to prescribed elements of an existing structure, as distinct from additions to an existing structure.

2.

Remodeling.

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Examples

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1. we are making a few alterations to the house.
2. the timetable is subject to alteration.
3. make any alterations as you may think fit.
4. he made extensive alterations on two of the pages.
5. the alteration of the past is necessary for two reasons.