Summit
late Middle English (in the general sense ‘top part’): from Old French somete, from som ‘top’, from Latin summum, neuter of summus ‘highest’.
wiktionary
From Late Middle English somete, from early Middle French somete, from Old French sommette, somet (compare modern French sommet), a diminutive of som(“highest part, top of a hill”), from Latin summum.
From Middle English *summit, *sumwit, *sumwiht, variant of sum wiht, som wiht(“some thing”, literally “some wight”). More at some, wight.
etymonline
summit (n.)
c. 1400, "highest point, peak," from Old French somete "summit, top," diminutive of som, sum "highest part, top of a hill," from Latin summum, neuter of noun use of summus "highest," related to super "over" (from PIE root *uper "over"). The meaning "meeting of heads of state" (1950) is from Winston Churchill's metaphor of "a parley at the summit."
