[countable]the way you feel at a particular timeCOLLOCATIONS COLLOCATIONS in a good mood (=happy) in a bad mood (=angry) in a foul mood (=in a very bad mood) in a confident/optimistic mood in a holiday/party/festive mood put somebody in a good/bad etc mood (=make someone feel happy, angry etc) get into the mood (=start to feel that you are ready and want to do something) mood of confidence/optimism/despair/gloom etc the general mood (=among a group of people) the mood of the time/moment somebody's mood changes mood swings (=sudden big changes in someone's mood) lighten somebody's mood (=make someone happier) reflect/capture somebody's mood (=show what someone is feeling)
to not want to do something, or be determined not to do something:
I was in no mood for a joke.
George was in no mood to be sociable.
way a place or event feels
[singular]the way that a place, event, book, film etc seems or makes you feel:
The opening shot of dark, rainy streets sets the mood for the whole film.
[countable]technicalSLGone of the sets of verb forms in grammar: theindicative (=expressing a fact or action), theimperative (=expressing a command), theinterrogative (=expressing a question) or thesubjunctive (=expressing a doubt or wish)
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.