What does Dispeller mean?

To break up, drive away, or cause to disappear: The breeze dispelled the bad odor. Her cheerfulness dispelled the gloom. The report dispelled my doubts. See Synonyms at scatter. [Middle English dispellen, from Latin dispellere : dis-, apart; see dis- + pellere, to drive; see pel- in Indo-European roots.]

What is the meaning of Dispeller of darkness?

— Swami Kriyananda. The word “guru” literally means “dispeller of darkness,” “darkness” referring to ignorance. On the most basic level that's just a teacher, of which we have many. However, we only have one true Guru, known as the Sat Guru in India. This teacher comes to teach us about our true Self or God.