Chemistry. a chemically inert gaseous element occurring in small amounts in the earth's atmosphere, used chiefly in a type of electrical lamp. Symbol: Ne; atomic weight: 20.183; atomic number: 10; density: 0.9002 g/l at 0°C and 760 mm pressure.
a sign or advertising sign formed from neon lamps.
using or containing the gas neon.
made of or formed by a neon lamp or lamps: a neon sign.
of, pertaining to, or characteristic of a tawdry urban district or of gaudy nighttime entertainment.

1895–1900; < Neo-Latin < Greek néon new, recent (neuter of néos); see -on1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
neon (ˈniːɒn)
1.  a colourless odourless rare gaseous element, an inert gas occurring in trace amounts in the atmosphere: used in illuminated signs and lights. Symbol: Ne; atomic no: 10; atomic wt: 20.1797; valency: 0; density: 0.899 90 kg/m³; melting pt: --248.59°C; boiling pt: --246.08°C
2.  (modifier) of or illuminated by neon or neon lamps: neon sign
[C19: via New Latin from Greek neon new]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1898, coined by Ramsay and Travers from Gk. neon, neut. of neos "new," so called because it was newly discovered. Neon sign is attested from 1927.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

neon ne·on (nē'ŏn')
Symbol Ne
A rare inert colorless gaseous element that occurs in air and glows reddish orange in an electric discharge. Atomic number 10; atomic weight 20.180; melting point -248.59°C; boiling point -246.08°C.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
neon   (nē'ŏn')  Pronunciation Key 
Symbol Ne
A rare colorless element in the noble gas group that occurs naturally in extremely small amounts in the atmosphere. It glows reddish orange when electricity passes through it, as in a tube in an electric neon light. Neon is also used for refrigeration. Atomic number 10; atomic weight 20.180; melting point -248.67°C; boiling point -245.95°C. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

Neon definition

Charles Duff. An object-oriented extension of FORTH, for the Mac. Inheritance, SANE floating-point, system classes and objects for Mac interfacing, overlays. Sold by Kriya Systems, 1985-1988. Modified, made PD and renamed Yerk.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Right now fall is favoring cool-factor shocks of bright, neon colors.
In some villages there are still coin-operated threshing machines next to neon
  coffee-vending machines.
The speed creates friction that heats up atmospheric gases and causes them to
  glow in much the same manner as neon signs.
The eye-catching motels, with their beckoning neon signs, are a stylistic
  extension of the boardwalk.
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