noun

• (colloquial) Clipping of magazine.
  "NY Mag"
• (colloquial) Clipping of magnet.
  "Get the mag in there to clear away the scrap."
• (colloquial, especially medicine) Clipping of magnesium.
  "She looks fine on physical exam, but I don't like these low mag levels."
• (colloquial, automotive) Ellipsis of mag wheel.
  "brand new tires and factory-original mags"

verb

• (transitive, obsolete, thieves' cant) To steal.
• (intransitive, obsolete, thieves' cant) To talk.
  ""Is that why you're always magging with Pascoe?" Horrible John went on. […] "So that's why you and him are always talking. And here's me thinkin' you was crawlin' for stripes.""

noun

• (UK, slang, obsolete) A halfpenny.
  ""Why, of course you wanted to get in," Mr. Bucket asserts with cheerfulness; "but for a old gentleman at your time of life […] not to consider that if he don't keep such a business as the present as close as possible it can't be worth a mag to him, is so curious! You see your temper got the better of you; that's where you lost ground," says Mr. Bucket in an argumentative and friendly way."

noun

• (aerospace) Acronym of maximum absorbency garment (astronaut diaper / space nappies).
• (biochemistry) Acronym of myelin-associated glycoprotein.
• (genetics) A gene which encodes for myelin associated glycoprotein