Definition of "president"

Well, nobody else can make a decision but me because I was the President and the final decision comes to the President, you know. I used to have a sign on my desk that said, "The Buck Stops Here." The buck stops at the president's desk when he's president of the United States, and he either makes the decisions or he lets them go by default, and you can't afford to do that when you're president.

1965, Harry S. Truman, 0:20 from the start, in MP2002-401 Former President Truman Discusses "The Buck Stops Here"‎, Harry S. Truman Presidential Library and Museum, National Archives Identifier: 595162

[…] to change the pattern of the last 220 years of only voting for a white male president, and elect a woman president […]

2007, Benjamin Camins, Hillary Is the Best Choice, Page 144

The President of the Senate shall, in the presence of the Senate and House of Representatives, open all the certificates and the votes shall then be counted;The person having the greatest number of votes for President, shall be the President, […]

1803, Twelfth Amendment to the United States Constitution‎

The thirſt of raigne and ſweetnes of a crowne,That cauſd the eldeſt ſonne of heauenly Ops,To thruſt his doting father from his chaire,And place himſelfe in the Emperiall heauen,Moou’d me to menage armes againſt thy ſtate.What better preſident than mightie Ioue?

c. 1587–1588, [Christopher Marlowe], Tamburlaine the Great. […] The First Part […], 2nd edition, part 1, London: […] [R. Robinson for] Richard Iones, […], published 1592; reprinted as Tamburlaine the Great (A Scolar Press Facsimile), Menston, Yorkshire, London: Scolar Press, 1973, Act II, scene vii

His angels president / In every province.

1671, John Milton, “The First Book”, in Paradise Regain’d. A Poem. In IV Books. To which is Added, Samson Agonistes, London: […] J. M[acock] for John Starkey […]