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Wordnet 3.0

ADJECTIVE (7)

1. definite but not specified or identified;
- Example: "set aside a certain sum each week"
- Example: "to a certain degree"
- Example: "certain breeds do not make good pets"
- Example: "certain members have not paid their dues"
- Example: "a certain popular teacher"
- Example: "a certain Mrs. Jones"

2. having or feeling no doubt or uncertainty; confident and assured;
- Example: "felt certain of success"
- Example: "was sure (or certain) she had seen it"
- Example: "was very sure in his beliefs"
- Example: "sure of her friends"
[syn: certain(p), sure]

3. established beyond doubt or question; definitely known;
- Example: "what is certain is that every effect must have a cause"
- Example: "it is certain that they were on the bus"
- Example: "his fate is certain"
- Example: "the date for the invasion is certain"

4. certain to occur; destined or inevitable;
- Example: "he was certain to fail"
- Example: "his fate is certain"
- Example: "In this life nothing is certain but death and taxes"- Benjamin Franklin
- Example: "he faced certain death"
- Example: "sudden but sure regret"
- Example: "he is sure to win"
[syn: certain, sure]

5. established irrevocably;
- Example: "his fate is sealed"
[syn: sealed, certain]

6. reliable in operation or effect;
- Example: "a quick and certain remedy"
- Example: "a sure way to distinguish the two"
- Example: "wood dust is a sure sign of termites"
[syn: certain, sure]

7. exercising or taking care great enough to bring assurance;
- Example: "be certain to disconnect the iron when you are through"
- Example: "be sure to lock the doors"
[syn: certain, sure]


The Collaborative International Dictionary of English v.0.48:

Certain \Cer"tain\, a. [F. certain, fr. (assumed) LL. certanus, fr. L. certus determined, fixed, certain, orig. p. p. of cernere to perceive, decide, determine; akin to Gr. ? to decide, separate, and to E. concern, critic, crime, riddle a sieve, rinse, v.] 1. Assured in mind; having no doubts; free from suspicions concerning. [1913 Webster] To make her certain of the sad event. --Dryden. [1913 Webster] I myself am certain of you. --Wyclif. [1913 Webster] 2. Determined; resolved; -- used with an infinitive. [1913 Webster] However, I with thee have fixed my lot, Certain to undergo like doom. --Milton. [1913 Webster] 3. Not to be doubted or denied; established as a fact. [1913 Webster] The dream is certain, and the interpretation thereof sure. --Dan. ii. 45. [1913 Webster] 4. Actually existing; sure to happen; inevitable. [1913 Webster] Virtue that directs our ways Through certain dangers to uncertain praise. --Dryden. [1913 Webster] Death, as the Psalmist saith, is certain to all. --Shak. [1913 Webster] 5. Unfailing; infallible. [1913 Webster] I have often wished that I knew as certain a remedy for any other distemper. --Mead. [1913 Webster] 6. Fixed or stated; regular; determinate. [1913 Webster] The people go out and gather a certain rate every day. --Ex. xvi. 4. [1913 Webster] 7. Not specifically named; indeterminate; indefinite; one or some; -- sometimes used independenty as a noun, and meaning certain persons. [1913 Webster] It came to pass when he was in a certain city. --Luke. v. 12. [1913 Webster] About everything he wrote there was a certain natural grace und decorum. --Macaulay. [1913 Webster] For certain, assuredly. Of a certain, certainly. Syn: Bound; sure; true; undeniable; unquestionable; undoubted; plain; indubitable; indisputable; incontrovertible; unhesitating; undoubting; fixed; stated. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Certain \Cer"tain\, n. 1. Certainty. [Obs.] --Gower. [1913 Webster] 2. A certain number or quantity. [Obs.] --Chaucer. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Certain \Cer"tain\, adv. Certainly. [Obs.] --Milton. [1913 Webster]
WordNet (r) 3.0 (2006):

certain adj 1: definite but not specified or identified; "set aside a certain sum each week"; "to a certain degree"; "certain breeds do not make good pets"; "certain members have not paid their dues"; "a certain popular teacher"; "a certain Mrs. Jones" 2: having or feeling no doubt or uncertainty; confident and assured; "felt certain of success"; "was sure (or certain) she had seen it"; "was very sure in his beliefs"; "sure of her friends" [syn: certain(p), sure] [ant: incertain, uncertain, unsure] 3: established beyond doubt or question; definitely known; "what is certain is that every effect must have a cause"; "it is certain that they were on the bus"; "his fate is certain"; "the date for the invasion is certain" [ant: uncertain] 4: certain to occur; destined or inevitable; "he was certain to fail"; "his fate is certain"; "In this life nothing is certain but death and taxes"- Benjamin Franklin; "he faced certain death"; "sudden but sure regret"; "he is sure to win" [syn: certain, sure] [ant: uncertain] 5: established irrevocably; "his fate is sealed" [syn: sealed, certain] [ant: uncertain, unsealed] 6: reliable in operation or effect; "a quick and certain remedy"; "a sure way to distinguish the two"; "wood dust is a sure sign of termites" [syn: certain, sure] 7: exercising or taking care great enough to bring assurance; "be certain to disconnect the iron when you are through"; "be sure to lock the doors" [syn: certain, sure]
Moby Thesaurus II by Grady Ward, 1.0:

286 Moby Thesaurus words for "certain": a, a certain, absolute, accurate, actual, adducible, admissible, agape, agog, all agog, an, anticipant, anticipating, anticipative, anticipatory, any, any one, apodictic, ascertained, assured, atomic, attestative, attested, attestive, authentic, authenticated, awaiting, based on, believing, bound, categorically true, certified, changeless, circumstantial, clear, clear and distinct, clear as day, cocksure, composite, conclusive, concrete, confident, confirmable, confirmed, constant, convinced, convincing, corroborated, covered, credible, cumulative, damning, decided, decisive, defined, definite, demonstrable, demonstrated, dependable, destined, detailed, determinate, determinative, determined, devout, different, distinct, distinguished, divers, documentary, documented, dogmatic, doubtless, eager, effectual, either, ensured, esoteric, especial, established, evidential, evidentiary, ex parte, exceptional, exclusive, expectant, expecting, express, extraordinary, eye-witness, factual, faithful, fated, fateful, fideistic, final, firm, firsthand, fixed, forearmed, forestalling, forewarned, founded on, gaping, grounded on, guaranteed, hearsay, historical, hopeful, implicit, impressed with, in anticipation, in expectation, in the cards, incontestable, incontrovertible, indefeasible, indicative, indisputable, individual, indivisible, indubitable, ineluctable, ineludible, inescapable, inevasible, inevitable, inexorable, infallible, inflexible, inner, insured, integral, intimate, invariable, irreducible, irrefutable, irresistible, irrevocable, lone, looking for, looking forward to, many, material, measured, minute, monadic, monistic, more, more than one, necessary, not in error, not singular, not surprised, noteworthy, numerous, nuncupative, objectively true, one, optimistic, overwhelming, particular, perfectly sure, permanent, personal, persuaded, pietistic, pious, pistic, plausible, plural, pluralistic, plurative, positive, precise, predestined, predetermined, prepared, presumptive, private, probative, provable, proved, quantified, quantitative, quantitive, quantized, ready, real, relentless, reliable, resistless, respective, sanguine, satisfied, secure, secured, set, settled, several, significant, simple, single, singular, sold on, sole, solid, solipsistic, solitary, some, special, specific, stable, standard, stated, steady, stipulated, substantiated, suggestive, sundry, sure, sure as death, sure as fate, sure-enough, surefire, symptomatic, telling, traditional, true, true as gospel, trustworthy, truthful, unalterable, unambiguous, unanalyzable, unavoidable, unchanging, unconfuted, uncontestable, uncontrollable, undeflectable, undeniable, undenied, under the impression, undisputed, undivided, undoubted, undoubtful, undoubting, unequivocal, unerring, unerroneous, unevadable, unfailing, unfallacious, unfalse, uniform, unique, unitary, univocal, unmistakable, unmistaken, unnamed, unpreventable, unquestionable, unquestioned, unrefuted, unspecified, unstoppable, unsurprised, unyielding, valid, validated, various, veracious, verifiable, verified, veritable, waiting, waiting for, warranted, watching for, weighty, well-grounded, whole, written