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The President solemnly swears or affirms...
The Chief Justice of the United States (Supreme Court) typically administers the oath of office to the incoming President. Another justice may swear in the Vice-President. Senior Justice John Paul Stevens administered the oath to Vice-President Biden at the 2008 inauguration.
oath of office
swear an oath of loyalty to the United States.
It means that he has taken the "Oath of Office", binding him to the duties and standards of the presidency. The oath includes the phrase, "I do solemnly swear" -- "sworn is the past-tense of swear" so after he takes the oath, he has sworn to do his duty and so has been sworn in to office.
The end of article two section one is important to inauguration day because it contains the oath that the president must take to become president. The Chief Justice of the US is most likely the person who the president states the oath to.