formal
1
a
: very large : containing a lot of space
a voluminous room
the building's high ceilings and voluminous spaces
b
of clothing
: using large amounts of fabric : very full
a voluminous skirt
2
: having very many words or pages
They carried on a voluminous correspondence. [=they wrote many long letters to each other]
a voluminous report
a writer of voluminous output
Cite this Entry
“Voluminous.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/voluminous. Accessed 24 Jun. 2026.
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