From Destinypedia, the Destiny wiki
Paracausality is a category used to refer to abilities, events or entities which seem to violate causality (i.e. the principle that all effects must have a preceding cause). It is also commonly referred to as "magic".
- Throughout the game, there has been an established difference between Paracausal and Acausal. Para- is a prefix meaning "beside; adjacent to", while causal refers to the physics of cause and effect. Paracausal is not the same as acausal, which is the opposite of causality with the Greek prefix a- ("not, without"). Paracausal thus means the Light and the Darkness obey physics which ignore or sidestep conventional cause-and-effect systems.