Open Definition & Meaning – Merriam-Webster

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: being an operation or surgical procedure in which an incision is made such that the tissues are fully exposed

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of a head injury : marked by fracture or penetration of the skull

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of a tone : produced by an open string or on a wind instrument by the lip without the use of slides, valves, or keys

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: characterized by ready accessibility and usually generous attitude: such as

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of an organ pipe : not stopped at the top

of a string on a musical instrument : not stopped by the finger

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of punctuation : characterized by sparing use especially of the comma when possible without causing misinterpretation

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mathematics

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: being an incomplete electrical circuit

transitive verb

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: to move (something, such as a door) from a closed position

: to make available for entry or passage by turning back (something, such as a barrier) or removing (something, such as a cover or an obstruction)

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: to initiate access to (a computer file) prior to use

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: to bring into view or come in sight of by changing position

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: to commence action in a card game by making (a first bid), putting a first bet in (the pot), or playing (a card or suit) as first lead

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: to restore or recall (something, such as an order) from a finally determined state to a state in which the parties are free to prosecute or oppose

intransitive verb

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: to become enlightened or responsive

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: to begin a course or activity

: to make a bet, bid, or lead in commencing a round or hand of a card game

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: to provide the opening performance of a show before the main event

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: open and unobstructed space: such as

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: an open contest, competition, or tournament

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: a public or unconcealed state or position

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Open Definition & Meaning - Merriam-Webster