Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To approve and give formal sanction to; confirm.

from The Century Dictionary.

  • To confirm; establish; settle conclusively or authoritatively; make certain or lasting.
  • To validate by some formal act of approval; accept and sanction, as something done by an agent or a representative; confirm as a valid act or procedure.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb To approve and sanction; to make valid; to confirm; to establish; to settle; especially, to give sanction to, as something done by an agent or servant

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb transitive To give formal consent to; make officially valid.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb approve and express assent, responsibility, or obligation

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English ratifien, from Old French ratifier, from Medieval Latin ratificāre : Latin ratus, fixed, past participle of rērī, to reckon, consider; see rate + Latin -ficāre, -fy.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Medieval Latin ratifico, from Latin ratus ("reckoned").

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