What does the greek term prohairesis refer to in respect to the philosophy of epictetus?

Prohairesis (Ancient Greek: προαίρεσις; variously translated as "moral character", "will", "volition", "choice", "intention", or "moral choice"[1]) is a fundamental concept in the Stoic philosophy of Epictetus. It represents the choice involved in giving or withholding assent to impressions