This is the 110th most frequent Japanese word.
午後
"Afternoon" or "PM."
'午後' (gogo) in this sentence is used to refer more broadly to an undefined time within the afternoon. It doesn't specify an exact time but rather provides a general timeframe.
映画は午後に始まります。
The movie starts in the afternoon.
The word '午後' (or 'gogo') here indicates the afternoon timeframe, specifically referring to times after 12 PM before 6 PM. It's used as a prefix to specify that the mentioned time (3時, 3 o'clock) is in the afternoon.
午後3時に会議があります。
There is a meeting at 3 PM.
'午後' (gogo) here is used alongside a reference to 'yesterday' (昨日) to talk about the afternoon of the past day, indicating time in a broader and more relative context.