IPA: /ˈædɪbəl/
KK: /ˈædɪbəl/
Able to be combined with something else or included in a group.
The components of the system are addible, allowing for easy upgrades.
Addible is formed from "add" (from Latin "addere", meaning to put to or join) and "-ible" (meaning capable of or suitable for). The word "addible" means capable of being added or suitable for addition.
Think of 'adding' something — 'add' means to join, and '-ible' means capable of. So, addible refers to something that can be added.