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In a general sense 'presiding officer' is synonymous with 'chairman'.
Specifically, 'Presiding Officer' is the title of the post of Speaker in the following legislatures:

★ Presiding Officer of the National Assembly for Wales

★ Presiding Officer of the Northern Ireland Assembly

★ Presiding Officer of the Scottish Parliament

★ Presiding Officer of the United States Senate (note: there is no actual office of "Presiding Officer": whoever is presiding is the Presiding Officer)