A high point: the highest point of any range, the most developed stage of any process, or the culmination of any field or historical period.
A paragon: a person or thing representing such a high point.
Synonym of crisis, the decisive moment in the course of an illness.
Full bloom or reproductive maturity.
The utmost; the highest or greatest degree; the farthest extent.
Outermost.
Extreme; utmost; of the farthest, greatest, or highest degree.