An ultimatum is a demand whose fulfillment is requested in a specified period of time and which is backed up by a threat to be followed through in case of noncompliance. An ultimatum is generally the final demand in a series of requests. As such, the time allotted is usually short, and the request is understood not to be open to further negotiation.
OmegaWiki Dictionary
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ultimatum Final demand made without intent of negotiation. It is usually the last step before a confrontation.
