IPA: /kəˈpeɪʃəsli/
KK: /kəˈpeɪʃəsli/
In a way that allows a lot of space or room; spaciously.
The suitcase was capaciously designed to hold many items without being bulky.
Capaciously → It is formed from "capax" (from Latin, meaning able to hold) and the suffix "-ious" (meaning full of) combined with the adverbial suffix "-ly". The word "capaciously" means in a manner that is full of capacity or able to hold much.
Think of 'capax' meaning able to hold, and remember that 'capaciously' describes doing something in a way that is full of capacity.