| open admissions |
the policy of admitting any student who desires to attend a university, regardless of proficiency. |
| open-air |
being, done, or occurring outdoors. |
| open air |
the outdoors. |
| open-and-shut |
(informal) not requiring much deliberation; not presenting ambiguity or difficulty; immediately obvious. |
| open chain |
in chemistry, a linear series of covalent atoms not joined at the ends into a cycle, such as an aliphatic compound. |
| open circuit |
an electrical circuit that is broken and carries no current. |
| open city |
a city in a war zone that is officially declared to be demilitarized and open to enemy occupation, and is thus rendered immune, by international law, to attack or bombardment. |
| open door |
free and unrestricted admission or access; unhindered opportunity. [2 definitions] |
| open-end |
lacking designated or agreed-upon limits. |
| open-ended |
not having fixed or set limits; unrestricted. [4 definitions] |
| opener |
someone or something that opens. [3 definitions] |
| open-eyed |
with the eyes open, esp. in amazement or wonder. [3 definitions] |
| open-faced |
having a frank, open face; unreserved; ingenuous. [2 definitions] |
| openhanded |
tending to give to others; generous. |
| openhearted |
frank or unreserved; candid. [2 definitions] |
| open-hearth |
of, concerning, or referring to a type of furnace used to make high-grade steel. [2 definitions] |
| open-heart surgery |
surgery involving diversion of the blood so that the heart can be exposed and repaired. |
| open house |
a time during which one's home is open to friends and relatives for informal visits. [2 definitions] |
| opening |
the act, process, or result of making open or causing to become open. [6 definitions] |
| open letter |
a letter, usu. of protest or criticism, that is addressed to a specific individual or group but published in a newspaper or magazine to gain public attention. |
| openly |
in a way that involves no hiding or lying. |