The meaning of OPEN is having no enclosing or confining barrier : accessible on all or nearly all sides. How to use open in a sentence. Synonym Discussion of Open.

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OPEN definition: 1. not closed or fastened: 2. ready to be used or ready to provide a service: 3. not closed in or…. Learn more.

Affording unobstructed entrance and exit; not shut or closed. b. Affording unobstructed passage or view: open waters; the open countryside. 2. a. Having no protecting or concealing cover: an …

Feb 10, 2026 · Related to English up. Noun from Middle English open (“an aperture or opening”), from the verb. In the sports sense, however, a shortening of “open competition”.

to make or become open: [no object] The flower opened up in the sun.[~ + up + object] They opened up their shops. [~ + object + up] It was too early to open the shops up.

OPEN definition: not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate. See examples of open used in a sentence.