alterable

adjective
UK /ˈɔːltərəbl/
US /ˈɔːltərəbl/

Something that can be changed.

The teacher said the schedule is alterable if we need more time.


OTHER MEANINGS

2. Able to be made different in form or appearance.

The dress design is alterable to fit any size.

3. Capable of being revised or corrected.

The plan is alterable before the final approval.

4. Not fixed or permanent; open to adjustment.

The rules are alterable by the committee each year.