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.
Phrases and idioms:
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.