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 open wound; …

Feb 2, 2026 · open (third-person singular simple present opens, present participle opening, simple past and past participle opened) To make or become physically unobstructed, uncovered, etc.

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.

Definition of open adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

The adjective open describes something that's not closed or blocked up, like open curtains that provide a view of the garden outside. Open can also refer to something that's unfastened or parted — an …

If you say that a fact or question is open to debate, interpretation, or discussion, you mean that people are uncertain whether it is true, what it means, or what the answer is.

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.