Plant-Based Diets Defined (by veganhealth.org)

Info Source: http://www.veganhealth.org/articles/def

Plant-based diets include:

Semi-Vegetarian - small amounts of animal flesh

Pesco-Vegetarian - eat no animal flesh except fish

Vegetarian
Lacto-Ovo - no animal flesh.
Vegan - no animal flesh, eggs, or dairy products