carrier (Noun) — Someone whose employment involves carrying something. ex. "the bonds were transmitted by carrier"
carrier (Noun) — A self-propelled wheeled vehicle designed specifically to carry something. ex. "refrigerated carriers have revolutionized the grocery business"
carrier (Noun) — A large warship that carries planes and has a long flat deck for takeoffs and landings.
carrier (Noun) — An inactive substance that is a vehicle for a radioactive tracer of the same substance and that assists in its recovery after some chemical reaction.
carrier (Noun) — A person or firm in the business of transporting people or goods or messages.
carrier (Noun) — A radio wave that can be modulated in order to transmit a signal.
carrier (Noun) — A man who delivers the mail.
carrier (Noun) — A boy who delivers newspapers.
carrier (Noun) — A rack attached to a vehicle; for carrying luggage, skis or the like.
carrier (Noun) — (medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others.
carrier (Noun) — (genetics) an organism that possesses a recessive gene whose effect is masked by a dominant allele; the associated trait is not apparent but can be passed on to offspring.