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The presiding officer of a committee or subcommittee. In the Senate, chairmanship is based on seniority of the committee tenure, but a Senate may not chair more than one standing committee.

The presiding officer of a [[committee]] or [[subcommittee]]. In the [[United States Senate|Senate]], chairmanship is based on seniority of the committee tenure, but a Senate may not chair more than one standing committee.<ref>[http://www.senate.gov/reference/glossary_term/chairman.htm] US Senate Reference</ref>