Merriam-Webster's Collegiate® Dictionary, 11th Edition
MOOD
I. noun
Etymology: Middle English, from Old English mōd; akin to Old High German muot mood Date: before 12th century a conscious state of mind or predominant emotion ; feeling , a fit of anger ; rage ,
3. a prevailing attitude ; disposition , a receptive state of mind predisposing to action, a distinctive atmosphere or context ; aura ,
II. noun
Etymology: alteration of 1mode
Date: 1569
the form of a syllogism as determined by the quantity and quality of its constituent propositions, distinction of form or a particular set of inflectional forms of a verb to express whether the action or state it denotes is conceived as fact or in some other manner (as command, possibility, or wish), mode 1b