as much or as good as necessary for some requirement or purpose; fully sufficient, suitable, or fit (often followed by to or for ): This car is adequate to our needs. adequate food for fifty people.
barely sufficient or suitable: Being adequate is not good enough.
Law. reasonably sufficient for starting legal action: adequate grounds.

1610–20; < Latin adaequātus matched (past participle of adaequāre). See ad-, equal, -ate1

adequately, adverb
adequateness, noun
preadequate, adjective
preadequately, adverb
preadequateness, noun
quasi-adequate, adjective
quasi-adequately, adverb
superadequate, adjective
superadequately, adverb
superadequateness, noun

1. satisfactory, competent, sufficient, enough; capable. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
adequate (ˈædɪkwɪt)
able to fulfil a need or requirement without being abundant, outstanding, etc
[C17: from Latin adaequāre to equalize, from ad- to + aequusequal]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1610s, from L. adæquatus "equalized," pp. of adæquare "to make equal to," from ad- "to" + æquare "make level," from æquus (see equal). The sense is of being "equal to what is required."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It's not that complex, my computer just lacks adequate processing power.
When the natural supply of nutrients isn't adequate, gardeners add fertilizer
  to make up the difference.
The words “thank you” hardly feel adequate.
Starved of adequate food, neither brain nor body develops appropriately.
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