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Wiktionary
gm

init. 1 general manager 2 group message

WordNet
gm

n. a metric unit of weight equal to one thousandth of a kilogram [syn: gram, gramme, g]

Wikipedia
GM

GM or Gm may refer to:

Usage examples of "gm".

He looks at the board and recalculates what the GMs with the next five picks will do.