Practise the thinking. Keep the judgement.
午前 (gozen): Morning; a.m.
ごぜん
gozen
Meaning
Morning; a.m.
Two original examples
午前九時に店が開きます。
The shop opens at 9 am.
予約は午前十時半です。
The appointment is at 10:30 am.
Usage and distinctions
午前 is used for times before noon. It contrasts with 午後, p.m. 正午 means noon. Expressions involving twelve o’clock can be confusing, so 正午 or a 24-hour time is clearer in a schedule.