verb (v)

• declare or make legally valid(verb.social)

  Synonym:
  formalise, formalize
  Antonym:
  annul, avoid, invalidate, nullify, quash, void
  

  source: wordnet30
• prove valid; show or confirm the validity of something(verb.cognition)

  Antonym:
  invalidate, nullify
  

  source: wordnet30
• give evidence for(verb.communication)

  Synonym:
  corroborate
  

  source: wordnet30
• make valid or confirm the validity of(verb.change)

  Example:
  Validate a ticket.
  

  Antonym:
  invalidate, vitiate, void
  

  source: wordnet30
• To confirm; to render valid; to give legal force to.(verb)

  source: webster1913