temperament

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