The word 'summit' originates from the Latin adjective 'summus', meaning 'highest', which is the superlative form of 'superus' (meaning 'that is above'). This Latin root is connected to the Proto-Indo-European (PIE) root uper, meaning 'over' or 'above'. The word entered English via Old French 'sommette', a diminutive form referring to the 'topmost part'. The semantic journey is direct, moving from the literal concept of the 'highest point' of a physical object, like a mountain, to its figurative application for the highest level of diplomatic meetings, representing the peak of political engagement.

The word 'summit' is a simplex loanword from Old French 'sommette', a diminutive of 'som' (meaning 'top'), which itself derives from Latin 'summum', the neuter form of 'summus' meaning 'highest'.