notion [notions](mental apprehension of whatever may be known or imagined; an idea; a conception) noun [UK: ˈnəʊʃ.n̩] [US: ˈnoʊʃ.n̩]I've lost notion of time. = Perdí la noción del tiempo.
noción "a posteriori" noun {f}
hindsight(after-the-fact realisation or understanding) noun [UK: ˈhaɪnd.saɪt] [US: ˈhaɪnd.ˌsaɪt]