What does go mean in Japanese?

Answer 1

Aa... if it is written as "五", it usually means "five", contrary to as if it is written "日本語" (Nihongo = Japanese language) or 英語 (Eigo = English language), where it is an indicator of a spoken language. Hope that helps! ~

Answer 2

午後 /gogo/ means "p.m." when telling the time.

午前 /gozen/ is for "a.m.".

E.g. : 午前８時に起きまして、午後１１時に寝ます。(gozen hachi ji ni okimashite, gogo juuichi ji ni nemasu) means [I get up at 8 a.m. and go to bed at 11 p.m.].