expression, adverb
Used when repeating an action or requesting a repetition. Slightly more formal than もう一回, but common in everyday speech.
もう一度言ってください。
Please say it once more.
彼はもう一度挑戦した。
He tried again.
もう一回 is more casual and often used in spoken Japanese; もう一度 is slightly more formal and can be used in both speech and writing.
Compound of もう (already, more) and 一度 (one time, once).