CARRIER

n. 1 a person or thing that carries. 2 a person or company undertaking to convey goods or passengers for payment. 3 = carrier bag. 4 a part of a bicycle etc. for carrying luggage or a passenger. 5 a person or animal that may transmit a disease or a hereditary characteristic without suffering from or displaying it. 6 = aircraft-carrier. 7 a substance used to support or convey a pigment, a catalyst, radioactive material, etc. 8 Physics a mobile electron or hole that carries a charge in a semiconductor. carrier bag Brit. a disposable plastic or paper bag with handles. carrier pigeon a pigeon trained to carry messages tied to its neck or leg. carrier wave a high-frequency electromagnetic wave modulated in amplitude or frequency to convey a signal.