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Morse code

noun
1.
either of two systems of clicks and pauses, short and long sounds, or flashes of light, used to represent the letters of the alphabet, numerals, etc.: now used primarily in radiotelegraphy by ham operators.
Also called Morse alphabet.
Origin
1830-1840
1830-40; after S. F. B. Morse
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Morse code

Morse code

noun
1.
a telegraph code formerly used internationally for transmitting messages; it was superseded by satellite technology (the Global Marine Distress and Safety System) in 1999. Letters, numbers, etc, are represented by groups of shorter dots and longer dashes, or by groups of the corresponding sounds, dits and dahs, the groups being separated by spaces Also called international Morse code
Word Origin
C19: named after Samuel Morse
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for Morse code
n.

1867, earlier Morse key (1858), in honor of Samuel F.B. Morse (1791-1872), U.S. inventor who produced a system of telegraphic communication 1836. He invented both the recording telegraph and the alphabet of dots and dashes.

Online Etymology Dictionary, © 2010 Douglas Harper
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Morse code in Science
Morse code  
A code developed by Samuel Morse used for transmitting messages in which letters of the alphabet and numbers are represented by various sequences of written dots and dashes, or short and long signals such as electric tones or voltages. Morse code was used extensively in telegraphy. In a format that has been standardized for international use, it is still sometimes used for long distance radio communication.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Morse code in Technology
communications
A coding system invented by Samuel A. Morse, for use in sending character data over extremely low-quality pathways -- such as telegraphs and low-quality radio. Morse code expresses characters as pulses of different durations. Short signals are called "dots" and long signals are calles "dashes". The coding assigns shorter sequences to the most frequently used characters.
American Morse code is the first and original Morse code character set. Character sets adapted to other languages were developed later.
American Morse Code:
A . __ J . . S . . . 1 . __ __ . B __ . . . K __ . __ T __ 2 . . __ . . C . . . L ___ U . . __ 3 . . . __ . D __ . . M __ __ V . . . __ 4 . . . . __ E . N __ . W . __ __ 5 __ __ __ F . __ . O . . X . __ . . 6 . . . . . . G __ __ . P . . . . . Y . . . . 7 __ __ . . H . . . . Q . . __ . Z . . . . 8 __ . . . . I . . R . . . 0 ____ 9 __ . . __
Where . is a short pulse, __ a long pulse, ___ a very long pulse and ____ a extra long pulse. There are also long and short spaces character-internal. Intercharacter spaces are very long and interword spaces are extra long. There is no standarisation in these durations, and they vary depending on the coder's preference and on the quality of the line.
Continental Morse Code or International Morse Code is a widely used de-facto standard. This table summarises the Western European usage of Continental Morse Code:
A .- G --. M -- S ... Y -.-- 4 ....- B -... H .... N -. T - Z --.. 5 ..... C -.-. I .. O --- U ..- 0 ----- 6 -.... D -.. J .--- P .--. V ...- 1 .---- 7 --... E . K -.- Q --.- W .-- 2 ..--- 8 ---.. F ..-. L .-.. R .-. X -..- 3 ...-- 9 ----.
A-umlaut (1) .-.- E-acute ..-.. A-acute .--.- N-tilde --.-- A-corona (11) .--.- O-umlaut (1) ---. CH (2) ---- U-umlaut (1) ..--
Punctuation Marks: Other Signs:
period .-.-.- warning .-..- comma --..-- error ........ question mark ..--.. repetition (ii ii) .. .. hyphen -....- wait (AS) .-... colon (3) ---... interruption (BK) -...-.- underline (4) ..--.- understood (VE) ...-. apostrophe .----. transmission received (R) .-. quotation mark .-..-. beginning of message (KA) -.-.- parenthesis open (5)-.--. end of message (AR) .-.-. parenthesis (close) -.--.- end of transmission (K) (6) -.- equal sign (7) -...- end of transmission (KN) (8) -.--. plus sign .-.-. closing mark (SK) (9) ...-.- multiplication sign -..- closing station (CL) -.-..-. fraction mark -..-. separator (10) .-..-
(1) Note: 'umlaut' is also known as 'diaeresis' (2) Used only in German; not in Dutch. (3) also: 'divided by' (4) before and after the word to be underlined (5) purportedly replaced by -.--.- for both "(" and ")" (6) both and invitation to any station to start transmission (7) also used as spacing between parts of transmission (8) also an invitation to one station in particular to start transmission (9) connection will be closed. (10) in fractions, for example. (11) A-ring ?
Where '.' is a short pulse, '-' a long one. A '-' is three times as long as a '.'; character-internal spaces are as long as '.'s. Intercharacter space are as long as -'s. Spaces between words are as long as seven '.'s.
(1996-11-23)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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