• synonyms

president pro tempore

or president pro tem

See more synonyms for president pro tempore on Thesaurus.com
noun U.S. Government.
  1. a senator, usually a senior member of the majority party, who is chosen to preside over the Senate in the absence of the vice president.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018