M3

1. USThe amount of cash, all bank accounts, etc., plus foreign currency in circulation.

   Synonyms: money supply

2. entertainmentmajor third

plural M3s

1. an ISO metric screw thread size for screws with a nominal outer diameter of 3 millimetres
2. a compact executive car model manufactured by BMW

   The result is an M3 that feels edgier, ready to change direction the instant the driver demands it.

   2001, Road & Track, volume 52, CBS Publications, page 54

   2 more examples

   BMW has softened the resonance considerably since we sampled an M3 on the autobahn a year ago, but this engine remains a howler.

   1987, Car and Driver, volume 33, Hachette Magazines, page 51

   When searching for an M3, look for a car with a record of maintenance that has been performed by an M3-knowledgeable mechanic. Better to have an unmaintained car than one that was butchered by someone who did not know what he was doing.

   2002, Fred Larimer, BMW Buyer's Guide, MotorBooks International, →ISBN, page 62