Etymology
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pinnacle (n.)

c. 1300, "mountain top, sharp peak, promontory," from Old French pinacle "top, gable" (13c.) and directly from Late Latin pinnaculum "peak, pinnacle, gable," extended form (via diminutive suffix, but not necessarily implying smallness) of Latin pinna "peak, point," (see pin (n.)). Figurative use is attested from c. 1400. The meaning "pointed turret on the buttress or roof of a building" is from late 14c.

Its constructive object is to give greater weight to the member which it crowns, in order that this may better resist some lateral pressure. The application of the term is generally limited to an ornamental spire-shaped structure, standing on parapets, angles, and buttresses, and often adorned with rich and varied devices. [Century Dictionary]

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Definitions of pinnacle
1
pinnacle (n.)
(architecture) a slender upright spire at the top of a buttress of tower;
pinnacle (n.)
the highest level or degree attainable; the highest stage of development;
...catapulted Einstein to the pinnacle of fame
Synonyms: acme / height / elevation / peak / summit / superlative / meridian / tiptop / top
pinnacle (n.)
a lofty peak;
2
pinnacle (v.)
surmount with a pinnacle;
pinnacle a pediment
pinnacle (v.)
raise on or as if on a pinnacle;
He did not want to be pinnacled
From wordnet.princeton.edu