noun

• A person's usual manner of thinking, behaving or reacting.
• A tendency to become irritable or angry.
• (music) The altering of certain intervals from their correct values in order to improve the moving from key to key.
• (psychology) Individual differences in behavior that are biologically based and are relatively independent of learning, system of values and attitudes.
• (obsolete) A moderate and proportionable mixture of elements or ingredients in a compound; the condition in which elements are mixed in their proper proportions.
• (obsolete) Any state or condition as determined by the proportion of its ingredients or the manner in which they are mixed; consistence, composition; mixture.