The ultimate is the consummate or best example of something.(noun)
An example of the ultimate is something that is the pinnacle of success.
The definition of ultimate is something that is the best of its kind.(adjective)
See ultimate in Webster's New World College Dictionary
Origin: LL ultimatus, pp. of ultimare, to come to an end < L ultimus: see ultima
See ultimate in American Heritage Dictionary 4
Origin: Latin ultimātus
Origin: , past participle of ultimāre, to come to an end
Origin: , from ultimus, last
Origin: , superlative of *ulter, on the other side; see al-1 in Indo-European roots.
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