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gram1 A gram is a unit used to measure weight using the metric system. If something weighs one gram, it weighs about as much as a raisin or a small safety pin. In the United States, people are more used to units of measure like pounds and ounces, but the metric system uses different units. The metric system is important because it is used in science and also in everyday life in most countries around the world.
safety pin a pin folded back on itself to form a clasp. There is a spring at one end and a guard at the other end to cover the point. A safety pin is used to hold two pieces of cloth or other material together.