Meaning of NICETY in English

NICETY

[noun] [U]I'm afraid I don't understand the nicety of your argument.Niceties are details or small differences which are only obvious after careful consideration.Our divorce settlement was delayed by a year because our lawyers spent a lot of time arguing about legal niceties.We don't bother with all the social niceties here.

Cambridge English vocab.      Кембриджский английский словарь.