v. 25B6; verb the chairman presides at the meeting : CHAIR, be chairman/chairwoman/chairperson, officiate (at), conduct, lead.
25A0; preside over BE IN CHARGE OF, be responsible for, be at the head/helm of, head, be head of, manage, administer, be in control of, control, direct, lead, govern, rule, command, supervise, oversee; informal head up, be boss of, be in the driving/driver's seat, be in the saddle.