This is the verse translation, not a definition of the individual word.
Allah is the Protector of those who believe; He brings them out of the depths of darkness into the light[1]. As for those who disbelieve, their protectors are false gods; they bring them out from the light into the depths of darkness. They are the people of the Fire; they will abide therein forever.
Source
[1] The light of truth is one, while the darknesses of disbelief, doubt and error are many.