Answer: summit

AnswerCrossword Clue
SUMMITDiplomatic-talk level
summitA meeting between heads of government
summitThe highest attainable level of achievement
summitThe highest point of a hill or mountain
summitto take part in a summit conference
SUMMITPeak
SUMMITCamp David event
SUMMITBase's opposite
SUMMITMeeting of leaders
SUMMITKind of meeting
SUMMITIt's all downhill from here
SUMMITZenith
SUMMITPinnacle
SUMMITClimber's goal
SUMMITCertain meeting
SUMMITThe top.
SUMMITKind of conference.
SUMMIT... conference.
SUMMITGeneva meeting, July, 1955.
SUMMITPeak.
SUMMITTop.
SUMMITCrest
SUMMITTop-level conference
SUMMITMountaintop
SUMMITHighest point
SUMMITHigh-level meeting