The highest level or degree attainable; the highest stage of development:
— The summit of his ambition.

synonyms: acme, elevation, height, meridian, peak, pinnacle, superlative, tiptop, top.

Roget 210: summit, summity^†; top, peak, vertex, apex, zenith, pinnacle, acme, culmination, meridian, utmost height, ne plus utra, height, pitch, maximum, climax, culminating point, crowning point, turning point; turn of the tide, fountain head; water shed, water parting; sky, pole.    tip, tip top; crest, crow's nest, cap, truck, nib; end etc. 67; crown, brow; head, nob^†, noddle^†, pate; capsheaf^†.    high places, heights.    topgallant mast, sky scraper; quarter deck, hurricane deck.    architrave, frieze, cornice, coping stone, zoophorus^†, capital, epistyle^†, sconce, pediment, entablature^†; tympanum; ceiling etc. (covering) 223.    attic, loft, garret, house top, upper story.    [metaphorical use] summit conference, summit; peak of achievement, peak of performance; peaks and troughs, peaks and valleys (in graphs). ... show more

Roget 650: perfection; perfectness etc. adj.; indefectibility^†; impeccancy^†, impeccability.    pink, beau ideal, phenix, paragon; pink of perfection, acme of perfection; ne plus ultra [Lat.]; summit etc. 210.    cygne noir [Fr.]; philosopher's stone; chrysolite, Koh-i-noor.    model, standard, pattern, mirror, admirable Crichton; trump, very prince of.    masterpiece, superexcellence etc. (goodness) 648^†; transcendence etc. (superiority) 33.    ... show more

Dutch: overtreffende trap, spits, hoogtepunt, toppunt, top
Polish: kulminacja

The top or extreme point of something (usually a mountain or hill):
— The region is a few molecules wide at the summit.

synonyms: crest, crown, peak, tip, top.

Dutch: bergtop, piek, apex, kruin, top

A meeting of heads of governments.

synonym: summit meeting.

Reach the summit (of a mountain):
— Many mountaineers go up Mt. Everest but not all summit.

synonym: breast.