ultimate

(noun) the finest or most superior quality of its kind. Examples: "The ultimate in luxury."

(adj) furthest or highest in degree or order; utmost or extreme. Synonyms: ultimate (vs. proximate). Examples: "The ultimate achievement." "The ultimate question." "Man's ultimate destiny." "The ultimate insult." "One's ultimate goal in life."

(adj) being the last or concluding element of a series. Examples: "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."