noun, adverb
The day of the week. Can be used as a noun or adverbially (e.g., 金曜日に, 金曜日は).
来週の金曜日は休みです。
Next Friday is a holiday.
金曜日に会議があります。
There is a meeting on Friday.
Abbreviation of 金曜日, used in schedules and casual contexts. 金曜日 is the full, standard form.
Compound of 金 (きん, 'gold/metal', associated with the planet Venus) + 曜日 (ようび, 'day of the week'). The naming follows the traditional seven-day cycle linked to celestial bodies.