How many letters does the top answer for “the quality of allowing light to pass diffusely” have?

The most common answer is translucence (12 letters).

Crossword clue: the quality of allowing light to pass diffusely

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

translucence 12 letters wn-def

the quality of allowing light to pass diffusely

translucency 12 letters wn-def

the quality of allowing light to pass diffusely

allowing light to pass through diffusely 67% similar → semitransparent, translucent