Second turning point (6)
I believe the answer is:
moment
I believe this is a double definition.
'second' is the first definition.
(synonyms)
'turning point' is the second definition.
(eg a 'moment of truth')
(Other definitions for moment that I've seen before include "Second, importance" , "Importance - point in time" , "The present Maureen intended, we hear" , "Jiffy" , "An exact point of time" .)