1.
three o'clock
The time at three hours past midnight or noon.
Three o'clock. Without 午前/午後, context determines whether it means 3 AM or 3 PM.
Common patterns
Cultural note
三時のおやつ (three o'clock snack) is a well-known concept in Japan. The afternoon snack break is traditionally associated with 3 PM, stemming from an old custom of having a light meal between lunch and dinner.
Related Words
Compare:
へ (direction marker (toward))