ac·me
ækmi/ [ak-mee]
noun
the highest point; summit; peak: The empire was at the acme of its power.
the highest point of perfection or achievement:
To act on this world-famous stage is surely the acme of any actor's career.

Origin:
1610–20; < Greek akmē int, highest point, extremity
Related forms
ac·mic /’ækmik/ [ak-mik] ac·mat·ic /æk’mætik/ [ak-mat-ik] adjective