1. last; furthest or farthest; ending a process or series: the ultimate point in a journey; the ultimate style in hats.
2. maximum; decisive; conclusive: the ultimate authority; the ultimate weapon.
3. highest; not subsidiary: ultimate goal in life.
4. basic; fundamental; representing a limit beyond which further progress, as in investigation or analysis, is impossible: the ultimate particle; ultimate principles.
5. final; total: the ultimate consequences; the ultimate cost of a project.