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“inaugural”
inaugural (adjective) (not comparative)
Relating to the beginning of an institution, an activity, or a formal ceremony to mark the beginning of a major public leader's term in office: There have been many Inaugural Addresses of the Presidents of the United States.
The inaugural speeches are made in connection with the following Executive Oath of Office: "I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States."