Emily Dickinson Lexicon

MOOD, n.¹ [Fr. mode; L. modus. See Mode.]

1. The form of an argument; the regular determination of propositions according to their quantity, as universal or particular, and their quality, as affirmative or negative. Watts. Encyc.
2. Style of music. Milton. Encyc.
3. The variation of a verb to express manner of action or being. [See Mode.] In the foregoing senses, and in all cases, this word when derived from the Latin modus, ought to be written mode, it being a distinct word from the following.