This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The property or degree of being distinct.

n. The quality or state of being distinct; a separation or difference that prevents confusion of parts or things.

n. Nice discrimination; hence, clearness; precision.

n. The quality or state of being distinct, in any sense of that word.

n. Synonyms Distinctness, Distinction (see distinction), plainness, perspicuity, explicitness, lucidity.

n. the state of being several and distinct

n. the quality of being sharp and clear

n. the quality of being not alike; being distinct or different from that otherwise experienced or known

"Like a man who is drowning, and close to death, he saw with surprising distinctness a kaleidoscopic view of his past life."

separation    difference   

extensive distinctness   

plainness    precision    clearness    perspicuity   

clearness    vividness    exactness    quickness    steadiness    directness    regularity    celerity    completeness    fluency