IPA: /rɪˈzɜːrvəbl/
KK: /rɪˈzɜrvəbl/
Able to be set aside or booked for future use.
The conference room is reservable for meetings and events.
Reservable → It is formed from "reservare" (meaning to keep back or save) and the suffix "-able" (meaning capable of being). The word "reservable" means capable of being reserved or set aside for future use.
Think of something that can be 'kept back' or 'saved' — that's what 'reservable' means, as it refers to something that can be set aside for later.