junction (in a semiconductor device) (general term)

A transition region between semiconductor regions of different electrical properties, or a physical region between a semiconductor region and a region of a different type; it is characterized by a potential barrier that impedes the movement of charge carriers from the region of higher concentration to the region with lower concentration.

References: 

JESD10, 9/81
JESD24#, 7/85
JESD77-B, 2/00
JESD282-B, 4/00