The Collaborative International Dictionary of English v.0.48:

Certificate \Cer*tif"i*cate\, n. [F. certificat, fr. LL.
   certificatus made certain, p. p. of certificare. See tify.]
   1. A written testimony to the truth of any fact; as,
      certificate of good behavior.
      [1913 Webster]

   2. A written declaration legally authenticated.
      [1913 Webster]

   Trial by certificate, a trial which the testimony of the
      person certifying is the only proper criterion of the
      point in dispute; as, when the issue is whether a person
      was absent in the army, this is tried by the certificate
      of the proper officer in writing, under his seal.
      --Blackstone.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Certificate \Cer*tif"i*cate\, v. t. [imp. & p. p.
   Certificated; p. pr. & vb. n. Certificating.] [See
   Certify.]
   [1913 Webster]
   1. To verify or vouch for by certificate.
      [1913 Webster]

   2. To furnish with a certificate; as, to certificate the
      captain of a vessel; a certificated teacher.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "certificate":
   CD, IOU, MO, acceptance, acceptance bill, affidavit, attestation,
   authority, authorization, bank acceptance, bank check, bill,
   bill of draft, bill of exchange, bill of health, blank check,
   certificate of deposit, certificate of proficiency, certification,
   certified check, check, checkbook, cheque, commercial paper,
   credential, debenture, demand bill, demand draft, deposition,
   diploma, draft, due bill, exchequer bill, letter of credit,
   money order, navicert, negotiable instrument, notarized statement,
   note, note of hand, paper, postal order, promissory note,
   sheepskin, sight bill, sight draft, sworn statement, testamur,
   testimonial, ticket, time bill, time draft, trade acceptance,
   treasury bill, visa, vise, voucher, warrant, warranty, witness