The property of being succinct, conciseness.(noun)
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Use "succinctness" in a sentence
"Twitter limits posts to 140 characters so succinctness is the key!"
"Suffering Succotash - is this forum being reduced to who is/is not eligible for the Hemingway prize in succinctness?"
"Not sure yet, but have decided to get into the swing of succinctity (I realize, but I dislike the sound of "succinctness" -- clumsy-sounding) by attempting a series of short posts."