Messenger

n. one who carries a message or goes on an errand, person employed to deliver official dispatches or go on special errands

The MErcury Surface, Space ENvironment, GEochemistry and Ranging (or MESSENGER for short) is a NASA mission, launched August 3, 2004, designed to study the characteristics and environment of Mercury from orbit. Specifically, the objectives of the mission are to characterize the chemical composition of Mercury's surface, the geologic history, the nature of the magnetic field, the size and state of the core, the volatile inventory at the poles, and the nature of Mercury's exosphere and magnetosphere over a nominal orbital mission of one Earth year. The mission will be the first to return to Mercury in over 35 years — the only previous probe to visit Mercury was Mariner 10, which completed its mission in March, 1975. MESSENGER will offer several vast improvements in scanning ability, with cameras that can resolve surface features down to just 60 feet across (18 meters) compared to the one mile (1.61 kilometer) resolution offered by Mariner 10. MESSENGER will also be the first probe to image the entire planet; Mariner 10 was only able to observe one hemisphere that was lit during its flybys.
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Messenger may refer to:ComputersAn instant messaging client or service in general, or specifically one of the following services:AOL Instant Messenger, an ad-supported instant messaging and presence computer program, published by America OnlineBitWise IM, an instant messaging client published by BitWise Communications, LLCGoogle Talk, an instant messaging client published by GoogleMiranda IM, an opensource instant messaging client released under GNU GPLMSN Messenger, the Microsoft instant messaging client preceding Windows Live Messenger Windows Live Messenger, an instant messaging client published by MicrosoftWindows Messenger, the instant messaging client bundled with Windows XPYahoo! Messenger, an instant messaging client published by Yahoo!QQ, an instant messaging client published by Tencent
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Messenger /mes·sen·ger/ an information carrier. second messenger any of several classes of intracellular signals acting at or situated within the [more]Messenger - Community and Resources

Noun
1. a person who carries a message
(synonym) courier
(hypernym) traveler, traveller
(hyponym) conveyer, conveyor

(n.)
One who, or that which, foreshows, or foretells.
  

(n.)
One who bears a message; the bearer of a verbal or written communication, notice, or invitation, from one person to another, or to a public body; specifically, an office servant who bears messages.
  

(n.)
A person appointed to perform certain ministerial duties under bankrupt and insolvent laws, such as to take charge og the estate of the bankrupt or insolvent.
  

(n.)
A hawser passed round the capstan, and having its two ends lashed together to form an endless rope or chain; -- formerly used for heaving in the cable.