IPA: /ˈstækəbl/
KK: /ˈstækəbl/
Able to be placed on top of each other in a neat and organized way.
The stackable chairs can be easily stored when not in use.
Stackable → It is formed from "stack" (from Old English *stacian*, meaning to arrange in a pile) and "-able" (meaning capable of). The word "stackable" means capable of being arranged in a pile or stacked.
Think of something that can be 'arranged in a pile' — 'stack' means to pile up, and '-able' means capable of doing that.