(Internet marketing) A measure used by marketers as an indication of how many people "view" or "open" the electronic mail they send out.

Alternative form of open door

A unrestricted means of admission or access. / The policy of admitting people or goods from foreign countries, on equal terms, into a host country.

Providing or establishing an open door.

Synonym of open admission (“type of college admissions process”)

plural of open enrollment

plural of open admission

(US, education) An unselective and noncompetitive college admissions process, where the only entrance criterion is a high-school diploma or a certificate of attendance or General Educational Development (GED) certificate.

(medicine) A fracture of a bone where one or more bone fragments penetrate the skin, forming an open wound.

A visit by a member of the public to a prisoner during which physical contact is permitted.