A time available in a schedule.
The first few measures of a musical composition.
The first performance of a show or play by a particular troupe.
A gap permitting passage through.
The initial period when a show at an art gallery or museum is first opened, especially the first evening.
A vacant position, especially in an array.
An unoccupied employment position.
In mathematical morphology, the dilation of the erosion of a set.
An act or instance of making or becoming open.
An opportunity, as in a competitive activity.
An act or instance of beginning.
The first few moves in a game.
Pertaining to the start or beginning of a series of events.
describing the first period of play, usually up to the fall of the first wicket; describing a batsman who opens the innings or a bowler who opens the attack
The assignment of something to a period of time that precedes it.
Growth in which lateral branches develop from a lateral meristem, after the formation of a bud or following a period of dormancy, when the lateral meristem is split from a terminal meristem.
A construction that consists of placing an element in a syntactic unit before that to which it would logically correspond.
The anticipation of an objection to an argument.
A so-called "preconception", i.e. a pre-theoretical notion which can lead to true knowledge of the world.
The practice of placing information about the ending of a story near the beginning, as a literary device.