(1) The office of the United States head of state
"A President is elected every four years"
(2) The chief executive of a republic
(3) The person who holds the office of head of state of the United States government
"The President likes to jog every morning"
(4) An executive officer of a firm or corporation
(5) The head administrative officer of a college or university
(6) The officer who presides at the meetings of an organization
"Address your remarks to the chairperson"
From Latin praesidens (accusative: praesidentem), meaning 'president, leader'. The Latin word is the substantivized present participle of the verb praesideo (infinitive: praesidere). The verb is composed from prae 'before' and sedere 'sit'. The original meaning of the verb is 'to sit before' in the sense of presiding at a meeting. A secondary meaning of the verb is 'to command, to govern'. So praesidens means 'the presiding one on a meeting' or 'governor, commander'.