"chairman" in the noun sense
1. president, chairman, chairwoman, chair, chairperson
the officer who presides at the meetings of an organization
"address your remarks to the chairperson"
"chairman" in the verb sense
1. chair, chairman
act or preside as chair, as of an academic department in a university
"She chaired the department for many years"
Source: WordNet® (An amazing lexical database of English)
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