The story
- Middle English · inherited fromclernesse
- English todayclearness
First known use, by meaning
- 14th–17th c. Brightness, brilliancy.
- from 16th c. Mental or sensory distinctness; clarity of understanding, perception etc.
- from 17th c. The state of being free from obscurities or opacity; distinctness of light, colour etc.
- from 17th c. The state of being free from obstruction or interference.
Etymology from Wiktionary, CC BY-SA 4.0.