Dictionary definition · pinnacle
noun
- (architecture) a slender upright spire at the top of a buttress or tower
- the highest level or degree attainable; the highest stage of development"his landscapes were deemed the acme of beauty"
- a lofty peak
verb
- surmount with a pinnacle"pinnacle a pediment"
- raise on or as if on a pinnacle"He did not want to be pinnacled"
Source: Open English WordNet (CC BY 4.0).