Formal FDA meetings are statutory FDA meetings in the process of drug development. These include Pre-IND Meeting, End of Phase II Meeting and Pre-NDA Meeting.
FDA formal meetings generally take one of three formats:
Face to Face, Teleconference or Videoconference & Written Responses Only (WRO). These depend on the the FDA, Sponsor and type of meeting.
Regulatory terminologies range from 'Fast Track' to 'Off Label Use' and many more. This video explains these useful terms in short descriptions.