/ ˈtemprəmənt; NAmE / noun
1.
[ C , U ] a person's or an animal's nature as shown in the way they behave or react to situations or people :
to have an artistic temperament
a horse with an excellent temperament
She's a dreamer and a romantic by temperament .
2.
[ U ] the tendency to get emotional and excited very easily and behave in an unreasonable way :
an actor given to displays of temperament
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WORD ORIGIN
late Middle English : from Latin temperamentum correct mixture, from temperare mingle. In early use the word was synonymous with the noun temper .