Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun An SIderived unit of power equal to one joule per second.
from The Century Dictionary.
 noun The practical unit of electrical activity or power. T
from the GNU version of the Collaborative International Dictionary of English.
 noun (Physics) A unit of power or activity equal to 107 C.G.S. units of power, or to work done at the rate of one joule a second. An English horse power is approximately equal to 746 watts.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun In the
International System of Units , thederived unit ofpower ; the power of a system in which onejoule ofenergy is transferred persecond . Symbol: W
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm
 noun Scottish engineer and inventor whose improvements in the steam engine led to its wide use in industry (17361819)
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

(Lumens per watt is similar to miles per gallon  the higher the number represents greater efficiency)

(Lumens per watt is similar to miles per gallon  the higher the number represents greater efficiency)
Sustainable Design Update » Blog Archive » LED Light Sets New Record

The cost per watt is an estimate of one study likely using only two current examples from industry.
Thin Film Solar Companies Raise Hundreds of Millions in Financing  Bits Blog  NYTimes.com

Lumensperwatt is the standard used by the lighting industry to measure the conversion of electrical energy to light.
Sustainable Design Update » Blog Archive » Super Efficient Lighting

A watt is a watt, be it delivered at a potential difference of 110 volts, 220 volts, or 440 volts.

A watt is a unit of measure equal to the power produced by a current of 1 amp across the potential difference of 1 volt.

A watt is a unit of measure equal to the power produced by a current of 1 amp across the potential difference of 1 volt.

A watt is a unit of measure equal to the power produced by a current of 1 amp across the potential difference of 1 volt.

A watt is a unit of measure equal to the power produced by a current of 1 amp across the potential difference of 1 volt.

A watt is a unit of measure equal to the power produced by a current of 1 amp across the potential difference of 1 volt.
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