
An executive agreement is an agreement between the heads of government of two or more nations that has not been ratified by the legislature as treaties are ratified. Executive agreements are considered politically binding to distinguish them from treaties which are legally binding. An executive agreement is one of three mechanisms by which the Uni...
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http://en.wikipedia.org/wiki/Executive_agreement

an agreement between the United States and a foreign government that is less formal than a treaty and is not subject to the constitutional ... [2 related articles]
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http://www.britannica.com/eb/a-z/e/58

an agreement, usually pertaining to administrative matters and less formal than an international treaty, made between chiefs of state without senatorial approval.
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https://www.infoplease.com/dictionary/executive-agreement
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