adequate for the purpose; enough: sufficient proof; sufficient protection.
Logic. (of a condition) such that its existence leads to the occurrence of a given event or the existence of a given thing. Compare necessary ( def 4c ).
Archaic. competent.

1350–1400; Middle English < Latin sufficient- (stem of sufficiēns), present participle of sufficere to suffice, equivalent to suf- suf- + -fici-, present stem of -ficere, combining form of facere to make, do1 + -ent- -ent

sufficiently, adverb
oversufficient, adjective
oversufficiently, adverb
presufficient, adjective
presufficiently, adverb
quasi-sufficient, adjective
quasi-sufficiently, adverb
supersufficient, adjective
supersufficiently, adverb

1. meager, scant, inadequate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sufficient (səˈfɪʃənt)
1.  enough to meet a need or purpose; adequate
2.  logic Compare necessary (of a condition) assuring the truth of a statement; requiring but not necessarily required by some other state of affairs
3.  archaic competent; capable
4.  a sufficient quantity
[C14: from Latin sufficiens supplying the needs of, from sufficere to suffice]

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

late 14c., from O.Fr. sufficient, from L. sufficiens, prp. of sufficere (see suffice).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
None of these points are discussed in detail or backed up with sufficient
The government should make sufficient efforts to rehabilitate these local
  people, villagers, tribes from these forests.
To cross it and then to come right back-that would be entirely sufficient,
  would satisfy my inexplicable yet acute hunger.
The stimulus alone, as it stands now, won't be sufficient to counter that fall.
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