1 [lahyt-nis]
the state or quality of being light in weight: the amazing lightness of the new metal.
the quality of being agile, nimble, or graceful.
lack of pressure or burdensomeness.
lack of seriousness; levity in actions, thoughts, or speech: That kind of lightness seemed out of place.
gaiety of manner, speech, style, etc.; cheerfulness: His lightness was just what the party needed.

1175–1225; Middle English. See light2, -ness

2. agility, grace, nimbleness, sprightliness. Unabridged


2 [lahyt-nis]
the state or quality of being light or illuminated.
thin or pale coloration.
the relative degree to which an object reflects light, especially light of complementary or nearly complementary colors.

before 1050; Middle English; Old English līhtness. See light1, -ness Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To lightness
World English Dictionary
light2 (laɪt)
1.  not heavy; weighing relatively little
2.  having relatively low density: magnesium is a light metal
3.  lacking sufficient weight; not agreeing with standard or official weights
4.  not great in degree, intensity, or number: light rain; a light eater
5.  without burdens, difficulties, or problems; easily borne or done: a light heart; light work
6.  graceful, agile, or deft: light fingers
7.  not bulky or clumsy
8.  not serious or profound; entertaining: light verse
9.  without importance or consequence; insignificant: no light matter
10.  frivolous or capricious
11.  loose in morals
12.  dizzy or unclear: a light head
13.  (of bread, cake, etc) spongy or well leavened
14.  easily digested: a light meal
15.  relatively low in alcoholic content: a light wine
16.  (of a soil) having a crumbly texture
17.  of a vessel, lorry, etc
 a.  designed to carry light loads
 b.  not loaded
18.  carrying light arms or equipment: light infantry
19.  Compare heavy (of an industry) engaged in the production of small consumer goods using light machinery
20.  aeronautics (of an aircraft) having a maximum take-off weight less than 5670 kilograms (12 500 pounds)
21.  chem (of an oil fraction obtained from coal tar) having a boiling range between about 100° and 210°C
22.  (of a railway) having a narrow gauge, or in some cases a standard gauge with speed or load restrictions not applied to a main line
23.  bridge
 a.  (of a bid) made on insufficient values
 b.  (of a player) having failed to take sufficient tricks to make his contract
24.  phonetics, prosody Compare heavy See also light (of a syllable, vowel, etc) unaccented or weakly stressed; short
25.  phonetics the least of three levels of stress in an utterance, in such languages as English
26.  informal light on lacking a sufficient quantity of (something)
27.  make light of to treat as insignificant or trifling
28.  a less common word for lightly
29.  with little equipment, baggage, etc: to travel light
vb (foll by on or upon) , lights, lighting, lighted, lit
30.  (esp of birds) to settle or land after flight
31.  to get down from a horse, vehicle, etc
32.  to come upon unexpectedly
33.  to strike or fall on: the choice lighted on me
[Old English lēoht; related to Dutch licht, Gothic leihts]

lightness (ˈlaɪtnɪs)
See also colour the attribute of an object or colour that enables an observer to judge the extent to which the object or colour reflects or transmits incident light

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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Example sentences
But our bodies use cues about lightness and dark to regulate our hormones and
  of course our sleep cycles.
But there was no mistaking the lightness of his résumé.
It is almost invariably white, which emphasizes its lightness and modernity.
With all his lightness of manner, he is essentially a witness under oath, and
  testifies only to what he is confident he knows.
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