In modern diplomacy, opportunity for political and commercial intercourse open to all upon equal terms, esp. with reference to a nation whose policy is wholly or partially fixed by nations foreign to itself, or to territory newly acquired by a conquering nation. In this sense, often used adjectively, as, open-door system, open-door policy, etc.
Open or free admission to all; hospitable welcome; free opportunity.
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Webster, Noah. Entry for 'Open Door'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/o/open-door.html. 1828.