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Jun 4, 2026 · 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.

The Open University offers flexible full-time and part-time study, supported distance and open learning for undergraduate and postgraduate courses and qualifications.

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Learn what open means with clear definitions, pronunciation, synonyms, and real-world examples. Simple explanations to help you use open correctly.

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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 …

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; …