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A recognized sequence of moves at the beginning of a game of chess
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The act of opening something
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Becoming open or being made open
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The first of a series of actions
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A vacant or unobstructed space that is man-made
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An entrance equipped with a hatch; especially a passageway between decks of a ship
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An aperture or hole that opens into a bodily cavity
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A possible alternative
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The initial part of the introduction
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The first performance (as of a theatrical production)
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A ceremony accompanying the start of some enterprise
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An open or empty space in or between things
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Opportunity especially for employment or promotion
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First or beginning