large in quantity or number; abundant; plentiful: copious amounts of food.
having or yielding an abundant supply: a copious larder; a copious harvest.
exhibiting abundance or fullness, as of thoughts or words.

1350–1400; Middle English < Latin cōpiōsus plentiful, rich, equivalent to cōpi(a) wealth (co- co- + op(s) Ops + -ia -ia) + -ōsus -ous

copiously, adverb
copiousness, copiosity [koh-pee-os-i-tee] , noun
overcopious, adjective
overcopiously, adverb
overcopiousness, noun
uncopious, adjective

1. bountiful. 2. See ample.

1. scanty, scarce. 3. meager. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
copious (ˈkəʊpɪəs)
1.  abundant; extensive in quantity
2.  having or providing an abundant supply
3.  full of words, ideas, etc; profuse
[C14: from Latin cōpiōsus well supplied, from cōpia abundance, from ops wealth]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  copious1
Part of Speech:  adj
Definition:  plentifully furnished; lavish
Etymology:  Latin copia 'plenty'
Main Entry:  copious2
Part of Speech:  adj
Definition:  full of, profuse; abundant
Etymology:  Latin copia 'plenty'
Main Entry:  copious3
Part of Speech:  adj
Definition:  full of information or matter
Etymology:  Latin copia 'plenty''s 21st Century Lexicon
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Word Origin & History

late 14c., from L. copiosus "plentiful," from copia "abundance, profusion, plenty," from com- "with" + ops (gen. opis) "power, wealth, resources," from PIE base *op- "to work, produce in abundance" (see opus). Related: Copiously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The same varieties of the cabbage do not yield abundant and nutritious foliage
  and a copious supply of oil-bearing seeds.
And that condemned food, which my sister grew up obliviously consuming in
  copious amounts, was pumpkin.
He has tossed off the top of his head and uttered himself in copious overflows
  of ghastly bosh.
He did nothing with the copious notes he took: he wasn't writing a book or even
  a blog.
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