This document defines a number of specification operators for the specification of defined transitions between features. A transition is an areal feature connecting two adjacent features, for which the intersection is a line. The transition includes portions of the adjacent features. These specifications all apply to any line in a defined direction in the transition feature. It also defines the specification modifiers and the drawing indications for such transition specifications. The proportions and dimensions of the graphical symbols to be used are also specified. NOTE 1 Corners (the transition between three or more features) are not considered transitions and are consequently not covered by this document. NOTE 2 A transition exists between two single features. A defined transition has a defined nominal shape and is not sharp (r = 0). This document provides a set of tools to express several defined transition specifications. It does not present any information on the relationship between a function or a use and a defined transition specification.