Noun, Adverb (fukushi)
3 o'clock
三時までには着きますよ。You'll get there by three o'clock. Noun
afternoon snack (eaten around 3 o'clock)
three ages of Buddhism (following the death of Gautama Buddha; age of the true law, age of the copied law, and age of the degeneration of the law); three ages of the dharma
Also written 三時【さんじ】