(idiomatic) To make someone aware of something they did not know or fully understand before; to enlighten someone.

(hunting, sometimes followed by on or for to designate the kind of animal hunted) A period of time during the calendar year when authorities within a jurisdiction permit the unrestricted hunting of one or more kinds of animal wildlife.

An opal consisting of concretions and fracture fillings in a dark siliceous ironstone matrix.

plural of open marriage

A marital relationship in which each partner agrees that the other partner may have sexual relations with other people as he or she sees fit.

(programming, object-oriented programming) Alternative spelling of open-closed principle

An often racy and satirical genre of English stage entertainment that originated in the 18th century.

(rugby) the portion of the field which is larger as measured from a scrum or breakdown to the touchline

A nineteenth-century form of French opera, emphasising melody and having a romantic or fantasy theme.

(UK regional) The medlar fruit.