Wordnet 3.0
NOUN (1)
1. 
 an endorsement made in a passport that allows the bearer to enter the country issuing it; 
VERB (2)
1. 
 provide (a passport) with a visa; 
2. 
 approve officially; 
- Example: "The list of speakers must be visaed"
The Collaborative International Dictionary of English v.0.48:
Vis'e \Vi*s['e]"\, n. [F. vis['e], p. p. of viser to put a visa
   to, fr. L. visus seen, p. p. of videre to see.]
   A document or an indorsement made on a passport by the proper
   authorities of certain countries, denoting that the passport
   has been examined, and that the person who bears it is
   permitted to proceed on her journey. Same as visa; -- an
   older spelling now used less frequently than visa.
   [1913 Webster + PJC]
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Visa \Vi"sa\, v. t. [imp. & p. p. Visaed; p. pr. & vb. n.
   Visaing.]
   To indorse, after examination, with the word vis['e], as a
   passport; to vis['e].
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Visa \Vi"sa\, n. [F.]
   A written stamp or document obtained by a citizen of one
   country from the proper authorities of another country,
   denoting that that person's passport has been examined, and
   that the person who bears the visa is permitted to enter or
   pass through the second country. It is usually in the form of
   an endorsement on the passport of the person seeking
   permission to enter a foreign country; however, in some cases
   a separate document is issued that does not create a mark in
   the passport. Same as Vis['e].
   [1913 Webster + PJC] Visa card
The Collaborative International Dictionary of English v.0.48:
Visa \Vi"sa\ (v[=e]"z[.a]), Visa card \Vi"sa card`\ (v[=e]"z[.a]
   k[aum]rd`), prop. n.
   A credit card issued with the Trade Name "Visa" on it; as, he
   charged the dinner to his Visa. Visa is a competitor of
   Master Card, Discover, MBNA, and American Express,
   and other credit card companies.
   [PJC]
WordNet (r) 3.0 (2006):
visa
    n 1: an endorsement made in a passport that allows the bearer to
         enter the country issuing it
    v 1: provide (a passport) with a visa
    2: approve officially; "The list of speakers must be visaed"
Moby Thesaurus II by Grady Ward, 1.0:
77 Moby Thesaurus words for "visa":
   John Hancock, OK, X, acceptance, affidavit, affirmance,
   affirmation, approbation, approval, attestation, authentication,
   authority, authorization, autograph, bill of health, certificate,
   certificate of proficiency, certification, christcross, cipher,
   clearance, confirmation, countermark, countersign,
   countersignature, counterstamp, credential, cross, deposition,
   device, diploma, endorsement, full pratique, go-ahead, green light,
   hand, imprimatur, initials, mark, mark of signature, monogram,
   navicert, nod, notarization, notarized statement, note, okay, pass,
   passport, permission, pratique, protection, ratification,
   rubber stamp, safe-conduct, safeguard, sanction, seal, sheepskin,
   sigil, sign manual, signature, signet, stamp, stamp of approval,
   subscription, sworn statement, testamur, testimonial, the nod,
   ticket, validation, vise, voucher, warrant, warranty, witness
Bouvier's Law Dictionary, Revised 6th Ed (1856):
VISA, civ. law. The formula put upon an act; a register; a commercial book,
in order to approve of it and authenticate it.