President of the Senate or Yang di-Pertua Dewan Negara "President of the Senate" or "Yang di-Pertua Dewan Negara" includes the Deputy President of the Senate or such other member of the Senate as may be determined by the rules of procedure of the Senate, whenever the Deputy President or such other member is acting as President of the Senate; ACT 388 - INTERPRETATION ACTS 1948 AND 1967 (CONSOLIDATED AND REVISED 1989) 66. DEFINITIONs.