What does open mean?
Open is a highly versatile English word whose basic idea is that something is not closed, fastened, or sealed. It describes a door left ajar, a path or route without a barrier, and an account or ticket that is available for use. From this physical sense, the word extends to information and institutions that are accessible, questions that have not been settled, and people who are receptive or candid. As a verb, open means to unfasten or unlock something, begin a session or business, or make an opportunity available. As a noun, an open can be a gap, a position, or an opportunity. Open also functions adverbially in expressions such as “wide open” and is central to compounds including “open market,” “open mind,” and “open source.” Its uses span ordinary physical description, formal discussion, and digital culture, where “open” often implies accessibility, sharing, and transparency. The word is useful because one clear concept—access rather than restriction—connects many apparently different meanings.
Not closed, fastened, or sealed; accessible, available, unrestricted, or not yet settled.
"The path through the forest is open to the public."
To unfasten or unlock something, begin an activity or session, or make something available for access.
"The organizers opened the ceremony by welcoming the audience."
An opening, opportunity, gap, or contest available to entrants.
"The defender saw an open and sent a pass across the field."
In a manner that leaves something unclosed, unrestricted, or exposed.
"The doors were left wide open."
The plural is used for gaps, opportunities, openings, or contests available to participants.
"The coach saw several promising opens in the defense."
A door may be open, a question may be open, and software may be open: the common thread is access without a barrier.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does open come from?
The English adjective and verb continue Old English forms open and opnon. They belong to a Germanic word family reflected in German offen, Danish åben, Swedish öppen, and Norwegian åpen. In modern English, the physical sense of lacking a barrier was extended metaphorically to availability, disclosure, public access, receptiveness, and unresolved status.
Related word forms
How open is actually used
Open is common in formal and informal English and can carry neutral or mildly positive connotations, especially when it suggests accessibility, candor, or freedom from restriction. In British and American English, the principal meanings and usages are broadly the same.
Easily confused with open
Open can mean not closed or fully accessible, whereas ajar specifically means slightly open, often only a narrow distance apart.