Etymology
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copious (adj.)

"abundant, plentiful," mid-14c., from Latin copiosus "plentiful," from copia "an abundance, ample supply, profusion, plenty; riches, prosperity; ability, power, might," also the name of the Roman goddess of abundance," from assimilated form of com "with, together" (see com-) + ops (genitive opis) "power, wealth, resources," from PIE root *op- "to work, produce in abundance." Related: Copiously; copiousness.

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Definitions of copious

copious (adj.)
large in number or quantity (especially of discourse);
she took copious notes
Synonyms: voluminous
copious (adj.)
affording an abundant supply;
copious provisions
Synonyms: ample / plenteous / plentiful / rich
From wordnet.princeton.edu