Digital media, such as audiovisual materials, that can be shared freely without commercial restrictions.

An open and/or public audition, especially for actors and actresses.

plural of open letter

plural of open mind

(intransitive, transitive) To open. / (intransitive) To reveal oneself; to share personal information about oneself; to become communicative. / (intransitive) To commence firing weapons.

A problem that has been posed in a field of study such as mathematics or theoretical computer science, but whose answer is not yet known.

(idiomatic) To remain vigilant for someone or something. / (idiomatic) To remain vigilant for a possibly dangerous situation.

An interior of a building constructed with few walls or obstructions, giving a communal aspect.

plural of open and shut case

A problem with an easy solution.