briefness

From Middle English breffnes, brevenesse, equivalent to brief +‎ -ness.

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briefness (usually uncountable, plural briefnesses)

1. The characteristic of being brief.

• (of short duration): brevity, fleetingness, transiency; see also Thesaurus:transience
• (of few words): brevity, conciseness, terseness; see also Thesaurus:succinctness