a.m.
US
UK a.m., am, A.M., AM adv: initialism (antemeridian: in the morning) (正午12时之前)
SC 早上，上午，午前，中午之前 zǎo shàng ，shàng wǔ，wǔ qián，zhōng wǔ zhī qián
TC 早上，上午
TC 早上，上午
You have a 9:30 a.m. appointment with the doctor.
This nightclub is open until 3 am.
antemeridian adj: (before noon)
SC 上午的
ante meridiem adv: Latin (in the morning) (拉丁语)
SC 早间
SC 早晨 zǎo chén
TC 早晨
TC 早晨