Concision is a word, but most people use the term brevity.
Concision is a regular and unexceptional word, but I think brevity has a slightly different connotation: “concision” implies that you’ve carefully phrased things to convey the most information in the fewest words, while “brevity” can imply that you’ve just left stuff out.
El Conciserino, if you're not into that whole 'brevity' thing, man.
I miss that rug. Really tied the room together.
Concision seems like it should be a word for that which is made concise rather than the brevity itself. An incision is the cut made by incising.
Incision can also be the practice of incising, but we don't need that word very much.
Concision is the right word, if speaking with a highly educated audience; if speaking with a less educated audience, perhaps “succinctness” or “efficient clarity” would be better understood, even if not conveying all of the connotations of concision.
“Conciseness” is a real word.
Concisiveness
That's a conflation of concise and divisive.
Ah I knew it wasn't a real word but not why it felt right, that's it right there. Neato
Name your kid Concise
Reject modernity, EMBRACE SEA TURTLE
I'm no expert, but didn't you just use it as a noun in the post title?
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.