What is the meaning of carrier?

noun

• Someone whose employment involves carrying something.
  • usage: "the bonds were transmitted by carrier"
  • synonyms: bearer, toter
• A self-propelled wheeled vehicle designed specifically to carry something.
  • usage: "refrigerated carriers have revolutionized the grocery business"
• A large warship that carries planes and has a long flat deck for takeoffs and landings.
  • synonyms: aircraft carrier, flattop, attack aircraft carrier
• 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.
• A person or firm in the business of transporting people or goods or messages.
  • synonyms: common carrier
• A radio wave that can be modulated in order to transmit a signal.
  • synonyms: carrier wave
• A man who delivers the mail.
  • synonyms: mailman, postman, mail carrier, letter carrier
• A boy who delivers newspapers.
  • synonyms: newsboy
• Medicine) a person (or animal) who has some pathogen to which he is immune but who can pass it on to others.
  • synonyms: immune carrier
• A rack attached to a vehicle; for carrying luggage or skis or the like.
• 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. (.