say it: LAHYT-nuhs
lightness is a noun meaning "a feeling of joy and pride". It carries 6 recorded senses.
a feeling of joy and pride
the property of being comparatively small in weight
“the lightness of balsa wood”
the gracefulness of a person or animal that is quick and nimble
the visual effect of illumination on objects or scenes as created in pictures
“he could paint the lightest light and the darkest dark”
the trait of being lighthearted and frivolous
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for lightness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.