| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| camail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: aventail, ventail |
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| email | (noun) (computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in | Synonyms: e-mail, electronic mail |
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| freemail | (noun) a service providing free email delivery in exchange for exposure to advertising | - |
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| greenmail | (noun) (corporation) the practice of purchasing enough shares in a firm to threaten a takeover and thereby forcing the owners to buy those shares back at a premium in order to stay in business | - |
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| mail | (noun) (Middle Ages) flexible armor made of interlinked metal rings | Synonyms: chain armor, chain armour, chain mail, ring armor, ring armour, ring mail |
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| (noun) a conveyance that transports the letters and packages that are conveyed by the postal system | - |
| (noun) the system whereby messages are transmitted via the post office | Synonyms: mail service, post, postal service |
| (noun) the bags of letters and packages that are transported by the postal service | - |
| (noun) any particular collection of letters or packages that is delivered | Synonyms: post |
| voicemail | (noun) a computerized system for answering and routing telephone calls; telephone messages can be recorded and stored and relayed | Synonyms: voice mail |
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