What is the meaning of mood?

noun

• A characteristic (habitual or relatively temporary) state of feeling.
  • usage: "whether he praised or cursed me depended on his temper at the time"; "he was in a bad humor"
  • synonyms: temper, humor, humour
• The prevailing psychological state.
  • usage: "the climate of opinion"; "the national mood had changed radically since the last election"
  • synonyms: climate
• Verb inflections that express how the action or state is conceived by the speaker.
  • synonyms: mode, modality