IPA: /ɪkˈstɛndəbl/
KK: /ɪkˈstɛndəbl/
Able to be made longer or larger in size or capacity.
The table is extendable, so it can fit more people when needed.
Extendable → It is formed from "extend" (from Latin "extendere", meaning to stretch out) and "-able" (meaning capable of). The word "extendable" means capable of being stretched out or made longer.
Think of something that can be 'stretched out' ('extend') — that's why 'extendable' means it can be made longer.