Culmination (6)
'culmination' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for apogee that I've seen before include "Final climactic stage" , "The point in its orbit where a satellite is at the greatest distance from the Earth" , "(Orbit) most distant point from earth" , "Culmination, climax" , "highly significant point" .)
'culmination' is the definition.
(I know that culmination can be written as climax)
This is the entire clue.
(Other definitions for climax that I've seen before include "Peak of a performance" , "Highest point" , "Peak of emotion" , "exciting finale" , "Crux, turning point" .)
'culmination' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for acme that I've seen before include "crown" , "Highest level or degree attainable" , "Summit - climax" , "'Highest point, apex (4)'" , "Summit, crowning point" .)