What is the meaning of Mag-?

Magnetic.

actor trigger verb prefix, infinitive form

1. durative action, action or state continuing in time; see Imperfective aspect

   durative action, action or state continuing in time; see Imperfective aspect

   action not necessarily intentional

   do something to oneself

   to become something; take an occupation

   contemplative aspect of mag-

   forms agent nouns, indicating one who does on a regular basis; -er

   forms agent nouns, same as above; -er

   actor trigger verb prefix, used to express:

   1. an action

      an action

      the taking up of an occupation

      the use or wearing of something

      a reciprocal action (for some verbs)

      : an action that will be done repeatedly, continually, or intensely

      : a reciprocal action involving three or more doers

      : an action to be done occasionally, at random, a little, a bit, now and then, or here and there

      verb prefix with no trigger/focus used to express being, occurrence, or existence

      noun prefix used to indicate:

      1. relationship between two persons

         relationship between two persons

         : relationship among three or more persons

         : occupation

         Source: wiktionary.org