Meaning

noun the highest level or degree attainable; the highest stage of development

noun the top or extreme point of something (usually a mountain or hill)

noun a meeting of heads of governments

originPIE word *upó The noun is derived from Late Middle English somet, somete (“head, top”) [and other forms], from Anglo-Norman sumet and Middle French sommet (masculine), somete, sommette (“top of a thing; highest point of a mountain”) (feminine) (modern French sommet), from Old French somet, sommette, from som, sum (“highest point, summit”) + -et (suffix forming diminutive masculine nouns), -ete,…

Etymology from Wiktionary, CC BY-SA 3.0