/ græm; NAmE / noun
1.
( BrE also gramme ) ( abbr. g , gm ) a unit for measuring weight. There are 1 000 grams in one kilogram.
2.
-gram a thing that is written or drawn :
telegram
hologram
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WORD ORIGIN
sense 1 late 18th cent.: from French gramme , from late Latin gramma a small weight, from Greek .
sense 2 from Greek gramma thing written, letter of the alphabet, from graphein write.