val·i·date 
(vălĭ-dāt′)
(vălĭ-dāt′)tr.v. val·i·dat·ed, val·i·dat·ing, val·i·dates
1. To establish the soundness, accuracy, or legitimacy of: validate the test results; validate a concern. See Synonyms at confirm.
2. To declare or make legally valid: validate an election.
3. To mark with an indication of official sanction: The official validated my passport with a stamp.
val′i·dation n.