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Look up Open in
Wiktionary, the free dictionary.

Open may refer to:

In philosophy

Openness, term being used to define the basis of how various groups and organizations operate.

In mathematics

Open problem, a well-defined problem with no known solution in science and mathematics
Open set, set in topology and related fields of mathematics
Opening, an operator in mathematical morphology

In music:

In other fields:

open (application), Nextstep & Mac OS X command line application that opens its argument(s) in the GUI as if the user had double clicked
Open circuit, in electronics, the absence of a load through which electric current would flow.
Open-source software, computer software modifiable by all, where users are treated as co-developers.
Open (magazine), a lifestyle Mexican publication.
Open (sport), type of competition in tennis, golf and other sports where entry is open to all qualifiers regardless of age or ability
Open vowel, vowel sound of a type used in most spoken languages
Open...., the original interactive television service on BSkyBs Sky Digital platform
Organization of Pakistani Entrepreneurs of North America, inclusive, not-for-profit organization.
Open Season, a movie made in Sony Animation.
the C POSIX library function open(2), defined in fcntl.h and used for C file input/output

See also