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open

/ˈəʊ.pən/
adjective
  1. Not closed

  2. Not physically drawn together, closed, folded or contracted; extended

    "an open hand; an open flower"

  3. Actively conducting or prepared to conduct business.

    "Banks are not open on bank holidays."

Synonymsfree, accessible, unimpeded, free
Antonymsclosed, shut, checked, closed, closed-source, proprietary

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