1. a person who is present and participates in a meeting

    e.g. he was a regular attender at department meetings
           the gathering satisfied both organizers and attendees

    Synonym: attendantattendeemeeter

2. someone who waits on or tends to or attends to the needs of another

    Synonym: attendanttender

3. someone who listens attentively

    Synonym: hearerlistenerauditor