adjective

1. beyond which it is impossible to go; farthest; most remote or distant
2. by which a process or series comes to an end; final; conclusive
3. beyond which further analysis, division, etc. cannot be made; elemental; fundamental; primary
4. greatest or highest possible; maximum; utmost

Etymology: LL ultimatus, pp. of ultimare, to come to an end < L ultimus: see ultima

noun