"The chairperson (also chair, chairman, or chairwoman) is the presiding officer of an organized group such as a board, committee, or deliberative assembly. The person holding the office, who is typically elected or appointed by members of the group, presides over meetings of the group, and conducts the group´s business in an orderly fashion.
In some organizations, the chairperson is also known as president (or other title). In others, where a board appoints a president (or other title), the two terms are used for distinctly different positions." - (en.wikipedia.org 28.09.2019)
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