1. noun /ˈfɹaɪdeɪ,ˈfraɪdi/
a) The sixth day of the week in many religious traditions, and the fifth day of the week in systems using the norm; the Biblical sixth day of a week, the day before the Sabbath, or "day of preparation" in preparation for the Sabbath; the Islamic sabbath; it follows Thursday and precedes Saturday. <!probably just an attributive form of the noun:
b) An appointment, person (like Man Friday in Robinson Crusoe), or feeling associated with this day of the week.
2. adverb /ˈfɹaɪdeɪ,ˈfraɪdi/
on Friday
Wikipedia foundation.