The noun chairman has 1 sense (first 1 from tagged texts)
1. (8) president, chairman, chairwoman, chair, chairperson -- (the officer who presides at the meetings of an organization; "address your remarks to the chairperson")
Overview of verb chairman
The verb chairman has 1 sense (no senses from tagged texts)
1. chair, chairman -- (act or preside as chair, as of an academic department in a university; "She chaired the department for many years")