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ope (archaic) to open. [2 definitions]
OPEC abbreviation of "Organization of Petroleum Exporting Countries."
op-ed a newspaper page, generally appearing opposite the editorial page, that presents the submitted opinions or contributions of readers, or a single signed article on such a page. [2 definitions]
open allowing entry or access; not shut, enclosed, or fastened. [27 definitions]
openable combined form of open.
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]