agenda
Synonym discussion
Sense: noun/1
For meetings, 'agenda' is the standard word for a prepared list of topics. 'Schedule' can overlap, but it usually tells you when things happen, not what will be discussed. 'Order of business' is more formal and narrower; it fits committee meetings, board meetings, and other structured settings. 'Plan' is broader and less tied to meetings, so it can describe almost any arrangement for future action. 'Itinerary' belongs to travel and events, not discussion points. In practice, a school might send parents an agenda before a meeting, a conference website posts a schedule, and a tour company gives you an itinerary. If the council changes the order of topics for Tuesday night, it changes the agenda, not the schedule.
Etymology
'Agenda' began as the Latin plural of 'agendum', meaning 'things to be done', from the verb 'agere', 'to do' or 'to drive'. English first used it in learned writing for matters that required action, and from that idea it widened to the modern senses of a meeting list, a program of goals, and even a hidden purpose behind what someone says or does.