already; anymore; again; other
Marks a change of state or a point of no return: something has already happened, is no longer ongoing, or will be done again.
もう has two main uses. First, it means 'already' when something has happened or is completed. You use it with past tense verbs or with present state to say 'already' – often implying it happened sooner than expected. Second, it means 'no longer' or 'anymore' when used with a negative verb or a negative state. In this case, it indicates that a previous situation has ended and will not continue. For example, もうお金がない means 'I have no money anymore' – implying you had some before but now it's gone. Third, with future time or a request, it can mean 'again' or 'another', as in もう一度 (mou ichido) 'once more'. You'll hear this word constantly in daily conversation.