Discernment is the activity of determining the value and quality of a certain subject or event, particularly the activity of going past the mere perception of something and making detailed judgments about that thing. As a virtue, a discerning individual is considered to possess wisdom, and be of good judgement; especially so with regard to subject matter often overlooked by others.
In Christianity, the word may have several meanings. It can be used to describe the process of determining God's desire in a situation or for one's life. In large part, it describes the interior search for an answer to the question of one's vocation, namely, determining whether or not God is calling one to the married life, single life, consecrated life, ordained ministry or any other calling.
Discernment of spirits
For the Discernment of spirits, see: https://en.wikipedia.org/wiki/Discernment_of_Spirits