The Correct spelling is: ultimatum
Common misspellings of the word ultimatum are:
How do you spell ultimatum?. It is not
n., pl. -tums or -ta (-tÉ™).
- A final statement of terms made by one party to another.
- A statement, especially in diplomatic negotiations, that expresses or implies the threat of serious penalties if the terms are not accepted.
[New Latin, from neuter of Latin ultimÄtus, last. See ultimate.]