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open set

British  

noun

  1. a set which is not a closed set

  2. an interval on the real line excluding its end points, as [0, 1], the set of reals between, but excluding, 0 and 1

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

But it didn't help, broken for a fifth straight time to open set two.

From Barron's • Jan. 27, 2026

Fox News also used a wide open set for “Shepard Smith Reporting,” when the anchor was still with the network.

From Los Angeles Times • Apr. 4, 2023

You can't just be out here running people and playing folks and not being honest about it, but if this is an open set of conversations, then by all means, have at it.

From Salon • Nov. 1, 2021

He even designed the open set, with the anchor’s desk in the center of a bustling newsroom.

From Washington Post • Jul. 29, 2020

Not wanting to be left behind, I hurried forward and jumped into the open set of chairs on the far right.

From "Glitch" by Laura Martin

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