昼夜

Traditional form:

晝夜

Pinyin (reading):

zhòuyè

Definitions:

• day and night
• period of 24 hours
• continuously, without stop

Characters:

• 昼 - daytime, daylight
• 夜 - night, dark; under cover of night

Traditional characters:

• 晝 - daytime, daylight
• 夜 - night, dark; under cover of night