[n. ser-tif-i-kit; v. ser-tif-i-keyt]
a document serving as evidence or as written testimony, as of status, qualifications, privileges, or the truth of something.
a document attesting to the fact that a person has completed an educational course, issued either by an institution not authorized to grant diplomas, or to a student not qualifying for a diploma.
Law. a statement, written and signed, which is by law made evidence of the truth of the facts stated, for all or for certain purposes.
verb (used with object), certificated, certificating.
to furnish with or authorize by a certificate.
to issue an official certificate attesting to the training, aptitude, and qualification of: to certificate a teacher.

1375–1425; late Middle English certificat < Medieval Latin certificātum, noun use of neuter of certificātus certified (past participle of certificāre), equivalent to certific- (see certify) + -ātus -ate1

certificatory [ser-tif-uh-ki-tawr-ee, -tohr-ee] , adjective
noncertificated, adjective
uncertificated, adjective

certificate, degree, diploma, license.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  an official document attesting the truth of the facts stated, as of birth, marital status, death, health, completion of an academic course, ability to practise a profession, etc
2.  short for share certificate
3.  (tr) to authorize by or present with an official document
[C15: from Old French certificat, from certifiercertify]

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

c.1480, "action of certifying," from Fr. certificat, from M.L. certificatum "thing certified," noun use of pp. of certificare (see certify). Of documents, from c.1490, especially a document which attests to someone's authorization to practice or do something (1549).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
My father was a junior, but not on his birth certificate.
He even produced a certificate from the local health department to prove it.
By the way, her age was changed on the marriage certificate.
Certificate authorities create a key pair of both a private and a public key
  for you.
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