beta
n.— «Stripping his suit to reveal a pair of bright green lycra tights, the Manhattan businessman lifts himself up on to the east face of the rock to demonstrate “the beta”—that’s climbese for the ability to flawlessly excecute a sequence of moves.» —“The Rat Rock Ballet In The Park” by John Hanc Newsday Oct. 16, 1989. (source: Double-Tongued Dictionary)
Further reading
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The Merriam-Webster.com dictionary now includes an entry for TL;DR, also rendered as TLDR. It’s a speedy way of dismissing overlong text or introducing a shortened version of something. This useful locution also inspired AI;DR, short for AI;didn’t...