Source : Webster's Revised Unabridged Dictionary (1913)

Certify \Cer"ti*fy\, v. t. [imp. & p. p. {Certified}; p. pr. &
   vb. n. {Certifying}.] [F. certifier, LL. certificare; L.
   certus certain + facere to make. See {Certain}, and cf.
   {Certificate}, v. t.]
   1. To give cetain information to; to assure; to make certain.

            We certify the king, that . . . thou shalt have no
            portion on this side the river.       --Ezra iv. 16.

   2. To give certain information of; to make certain, as a
      fact; to verify. --Hammond.

            The industry of science at once certifies and
            greatly extends our knowledge of the vastness of the
            creation.                             --I. Taylor.

   3. To testify to in writing; to make a declaration
      concerning, in writing, under hand, or hand and seal.

            The judges shall certify their opinion to the
            chancellor, and upon such certificate the decree is
            usually founded.                      --Blackstone.

   {Certified check}, A bank check, the validity of which is
      certified by the bank on which it is drawn.

Source : WordNet®

certified
     See {certify}

certify
     v 1: provide evidence for; stand as proof of; show by one's
          behavior, attitude, or external attributes; "His high
          fever attested to his illness"; "The buildings in Rome
          manifest a high level of architectural sophistication";
          "This decision demonstrates his sense of fairness" [syn:
           {attest}, {manifest}, {demonstrate}, {evidence}]
     2: guarantee payment on; of checks
     3: authorize officially; "I am licensed to practice law in this
        state" [syn: {license}, {licence}] [ant: {decertify}]
     4: guarantee as meeting a certain standard; "certified grade
        AAA meat" [syn: {endorse}, {indorse}]
     5: declare legally insane
     [also: {certified}]

certified
     adj 1: endorsed authoritatively as having met certain requirements;
            "a certified public accountant" [ant: {uncertified}]
     2: having quality or payment or delivery guaranteed; "certified
        milk"; "certified check"; "certified mail"
     3: fit to be certified as insane (and treated accordingly)
        [syn: {certifiable}]
     4: holding appropriate documentation and officially on record
        as qualified to perform a specified function or practice a
        specified skill; "a registered pharmacist"; "a registered
        hospital" [syn: {qualified}]