Pronunciation: (ul"tu-mā'tum, -mä'-), [key]
—pl. -tums, -taPronunciation: (-tu). [key]
1. a final, uncompromising demand or set of terms issued by a party to a dispute, the rejection of which may lead to a severance of relations or to the use of force.
2. a final proposal or statement of conditions.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.