1 In the theory of the syllogism the valid forms with each figure are called the moods of that figure.
2 In the philosophy of language the mood of a sentence (indicative, imperative, subjunctive, etc.) is a feature whose best representation is problematic. The most common view is that mood indicates the force of an utterance, rather than being a feature affecting its sense, so that ‘shut the door!’ and ‘the door is shut’ can be thought of as having a common content, but presenting it in a different way and for a different purpose. See also phrastic/neustic.
Philosophy dictionary. Academic. 2011.