Literally, president "for a time"; elected from its membership by the Senate, he usually, but not necessarily, presides in the absence of the Lieutenant Governor.
official who leads the Senate's day-to-day operations.
A constitutionally recognized officer of the Senate who presides over the chamber in the absence of the Vice President. The President Pro Tempore (or, "president for a time") is elected by the Senate and is, by custom, the Senator of the majority party with the longest record of continuous service.
President "for a time": a Senator elected to serve as the temporary President in the absence of the President of the Senate.
Because the vice president, who is president of the Senate is seldom present to preside, the Senate elects a "president pro tempore," or temporary president who, if he does not preside each day, assigns the job to another senator, usually of junior seniority.
Acting president of the United States Senate in the absence of the Vice President who is the constitutionally authorized President of the body.
The Senator, elected by the Senate, chosen to preside in lieu of the President when such officer is absent or unable to preside.
The presiding officer of the Senate in the Vice President's absence, elected by the full Senate.
The temporary presiding officer of the Senate, who services when the Vice President of the U.S. is absent (which is most of the time).
The presiding officer of the Senate appointed by the President of the Senate to preside when the President is absent or leaves the podium for any reason.
The presiding officer of the Senate in the Vice President's absence. This individual is selected by his/her colleagues and traditionally has been a Senator from the majority party who has the longest continuous service. (See President of the Senate)