ultimate
noun
the finest or most superior quality of its kind
“the ultimate in luxury”
adjective
furthest or highest in degree or order; utmost or extreme
“the ultimate achievement”
“the ultimate question”
Oppositesproximatebeing the last or concluding element of a series
“the ultimate sonata of that opus”
“a distinction between the verb and noun senses of `conflict' is that in the verb the stress is on the ultimate (or last) syllable”
Source: WordNet 3.1, Princeton University