noun Telecommunications.
a unit used to measure the speed of signaling or data transfer, equal to the number of pulses or bits per second: baud rate.

1925–30; named after J. M. E. Baudot (1845–1903), French inventor

baud, bawd. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
baud (bɔːd)
a unit used to measure the speed of electronic code transmissions, equal to one unit interval per second
[C20: named after J. M. E. Baudot (1845--1903), French inventor]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1932, originally a unit of speed in telegraphy, coined in Fr. 1929 in honor of Fr. inventor and engineer J.M.E. Baudot (1845-1903), who designed a telegraph printing system.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

baud definition

communications, unit
/bawd/ (plural "baud") The unit in which the information carrying capacity or "signalling rate" of a communication channel is measured. One baud is one symbol (state-transition or level-transition) per second. This coincides with bits per second only for two-level modulation with no framing or stop bits.
A symbol is a unique state of the communication channel, distinguishable by the receiver from all other possible states. For example, it may be one of two voltage levels on a wire for a direct digital connection or it might be the phase or frequency of a carrier.
The term "baud" was originally a unit of telegraph signalling speed, set at one Morse code dot per second. Or, more generally, the reciprocal of the duration of the shortest signalling element. It was proposed at the International Telegraph Conference of 1927, and named after J.M.E. Baudot (1845-1903), the French engineer who constructed the first successful teleprinter.
The UK PSTN will support a maximum rate of 600 baud but each baud may carry between 1 and 16 bits depending on the coding (e.g. QAM).
Where data is transmitted as packets, e.g. characters, the actual "data rate" of a channel is
R D / P
where R is the "raw" rate in bits per second, D is the number of data bits in a packet and P is the total number of bits in a packet (including packet overhead).
The term "baud" causes much confusion and is usually best avoided. Use "bits per second" (bps), "bytes per second" or "characters per second" (cps) if that's what you mean.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The latency of this information is determined by the baud rate at which it is transmitted.
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