attender in WordNet English dictionary

1. someone who waits on or tends to or attends to the needs of another
   attendant  attender  tender 
   
2. a person who is present and participates in a meeting
   "he was a regular attender at department meetings"; "the gathering satisfied both organizers and attendees"
   attendant  attender  attendee  meeter 
   
3. someone who listens attentively
   hearer  listener  auditor  attender