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
Even when the ocean seems calm, swells are moving water up and down
  sufficiently to generate electricity.
But snow pack and other natural insulators can keep the frogs sufficiently warm
  during their winter hibernation.
If your mailbox is sufficiently sized, then check with the post office to see
  if the magazine arrives in good condition.
The plane managed to glide sufficiently out of the ash plume for three of the
  four badly damaged engines to restart.
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