"Introductory dive" refers to a first-time experience of diving, where someone who is new to diving gets to try it out for the first time under the guidance of an instructor. Full definition
Training ranges from introductory dives and beginner dive courses through to instructor certifications. (diveplanit.com)
If you wish to try your first introductory dive then definitely book this boat. (cairnsattractions.com.au)
Departing Cairns Monday at noon, there's two introductory dives on Cairns» Outer Great Barrier Reef before Spirit of Freedom powers up and takes you to the spectacular Ribbon Reefs. (tusadive.com)