Webster's English Dictionary

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preside

pre.side \pri-'zi-d\ vi [L praeside-re to guard, preside over, lit., to sit 
   in front of, sit a]t the head of, fr. prae- + sede-re to sit - more at SIT 
   1a: to occupy the place of authority : act as president, chairman, or mo 
   derator 1b: to occupy a position similar to that of a president or chairman 
    2: to exercise guidance, direction, or control  3: to occupy a position of 
   featured instrumental performer