According to Poizat's book on stable groups, a stable theory is said to be '''unidimensional''' if any two non-algebraic types are non-orthogonal. It is a theorem, apparently due to Hrushovski and using stable groups, that any unidimensional theory is in fact superstable. Unidimensional theories include things like strongly minimal theories, uncountably categorical (countable) theories, and theories T which are \kappa-categorical for large \kappa (maybe \kappa > |T|?).