IPA: /kəˈlæpsəˌbɪlɪti/
KK: /kəˈlæpsəˌbɪlɪti/
The quality or state of being able to be collapsed or folded down into a smaller size.
The collapsibility of the tent makes it easy to store and transport.
Collapsibility is formed from "collaps-" (from Latin "collapsus", meaning to fall together) and "-ibility" (from Latin "-ibilis", meaning capable of). The word describes the quality of being capable of falling together or collapsing.
Think of something that can 'fall together' ('collaps-') easily, which is what collapsibility means.