Definify.com

Webster 1828 Edition

, n.

Freedom from foul or extraneous matter; purity; as the clearness of water, or other liquor.

Freedom from obstruction or incumbrance; as the clearness of the ground.

Freedom from fogs or clouds; openness; as the clearness of the sky. It generally expresses less than brightness or splendor. Ex. 24.

Distinctness; perspicuity; luminousness; as the clearness of reason, of views, of arguments, of explanations.

Plainness, or plain dealing; sincerity; honesty; fairness; candor.

Freedom from imputation of ill.

Freedom from spots, or any thing that disfigures; as the clearness of the skin.

clearness ‎(usually uncountable, plural clearnesses)

(obsolete) Brightness, brilliancy. [14^th-17^thc.]
- 1485, Sir Thomas Malory, chapter xv, in Le Morte Darthur, book XVII:
  Thenne sayd he Fair swete fader Ihesu Cryst yf euer I dyd thyng that pleasyd the lord / for thy pyte ne haue me not in despyte for my synnes done afore tyme / and that thou shewe me some thynge of that I seke / And with that he sawe the chamber dore open and there came oute a grete clerenes / that the hows was as bryghte as all torches of the world had ben there
Mental or sensory distinctness; clarity of understanding, perception etc. [from 16^thc.]
- 1966, "The Lowest Depths", Time, 6 September:
  The daily press is the evil principle of the modern world, and time will only serve to disclose this fact with greater and greater clearness.
The state of being free from obscurities or opacity; distinctness of light, colour etc. [from 17^thc.]
The clearness of the water meant I could still see the key lying on the river-bed.
The state of being free from obstruction or interference. [from 17^thc.]
The clearness of the path made for an easy hike.

the state or measure of being clear