alteration

An important or serious change.

A small and unimportant change.

An important or noteworthy change.

A very small change.

A basic and essential change.

A change that is not large in size or degree.

A change of a large size or importance.

A very large and noticeable change.

A thorough and complete change.

A change affecting a large area or scope.

A small change that is not easy to notice.

Used to specify the object that has been changed.

Used to specify what has been changed.

The most common way to say you are changing something.

When a change is necessary, often in a formal or official context.

When a change is necessary.

To perform or complete a change, often in a formal or planned context.

To experience a change (used for the thing that is changed).

To be the reason for a change.

To make a change, more informal than 'carry out'.