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semaphore
semaphore , device for the visible transmission of messages. The marine semaphore, used by day between ships or between a ship and the shore, consists essentially of a post at the top of which are two pivoted arms. The arms are connected by light gearing to two operating levers. Each letter of the a...
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e
e
•
symb.
∎
(also e−) Chem.
an electron.
∎
(e) Math.
the transcendental number that is the base of Napierian or natural logarithms, approximately equal to 2.71828.
e3 / ē/ • n. (pl. e's ) a...
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electronic mail
electronic mail or e-mail, the electronic transmission of messages, letters, and documents. In its broadest sense electronic mail includes point-to-point services such as telegraph and facsimile (fax) systems. It is commonly thought of, however, in terms of computer-based message systems wh...
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prophet
prophet [Gr.,=foreteller], a religious leader and spokesperson, particularly used in the Bible. The prophets emitted messages from the divine through inspired speech, the interpretation of omens and dreams, and the casting of lots and divination. The word derives from Greek cults, in which prophets...
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Titanic
Titanic , British liner that sank on the night of Apr. 14-15, 1912, less than three hours after crashing into an iceberg in the N Atlantic S of Newfoundland. More than 1,500 lives were lost. The Titanic, thought to be the fastest ship afloat and almost unsinkable, was on her maiden voyage and carr...
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information theory
information theory or communication theory, mathematical theory formulated principally by the American scientist Claude E. Shannon to explain aspects and problems of information and communication. While the theory is not specific in all respects, it proves the existence of optimum coding sche...
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body language
body language nonverbal communication by means of facial expessions, eye behavior, gestures, posture, and the like. Body language expresses emotions, feelings, and attitudes, sometimes even contradicting the messages conveyed by spoken language. Some nonverbal expressions are understood by people i...
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Four Freedoms
Four Freedoms In his message to Congress proposing lend-lease legislation (Jan. 6, 1941), President Franklin Delano Roosevelt stated that Four Freedoms should prevail everywhere in the world—freedom of speech and expression, freedom of worship, freedom from want, and freedom from fear. These ...
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heliograph
heliograph [Gr.,=sun-writer], signaling device using flashes of sunlight. It has two mirrors that are used to reflect sunlight on a distant point and a shutter through which the sunlight passes so that messages may be transmitted in telegraphic code by means of long and short flashes. It was used i...
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Bob Marley
Bob Marley 1945-81, Jamaican reggae singer, songwriter, and guitarist. As a member of the Wailers, a reggae band that included Bunny Wailer and Peter Tosh, and later on his own, Marley propelled reggae to worldwide popularity. His commitment to nonviolence and the Rastafarian religion are transpare...
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