Definition of culminations:
(n) :
(UK, Canada) An endpoint arrived at after some series of actions or events, or some period, usually after the series or period has ended. The sum of something.
(n) :
(US) An attainment or arrival at the highest pitch of glory, power, etc.
(n) :
(US, education) A ceremony marking the completion of studies at an elementary school, middle school or junior high school.
(n) :
(astronomy) The attainment of the highest point of altitude reached by a heavenly body; passage across the meridian; transit.