This is the 153rd most frequent Japanese word.
午前
"Morning" or "a.m."
In this sentence, '午前' is used to specify the morning time of the day, indicating 'a.m.'.
午前9時に会議があります。
There is a meeting at 9 a.m.
Here, '午前' is used to describe the time period during the morning, as an unspecified range.
私は午前に散歩するのが好きです。
I like taking walks in the morning.
The term '午前中' refers to the morning period, highlighting that the contact should occur during this timeframe.