summiteerPronunciation: /sʌmɪˈtɪə/Definition of summiteer noun 1a participant in a meeting between heads of government: by tradition, summiteers do not embarrass each other before an election 2a climber who has reached the summit of a mountain: until last year the 70-odd summiteers were matched by the 70 people who had died on its flankssummiteer in other Oxford dictionaries Definition of summiteer in the US English dictionary