Having a lot of space inside; roomy and spacious. Able to contain a large quantity or number of things.
From Latin 'capax' meaning able to hold much, from 'capere' (to take, hold). The word entered English in the 17th century, maintaining its sense of having large capacity or space.
Think 'capacity' - capacious means having great capacity! Like a capacious backpack that can hold everything you need for a week-long trip.
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