Wiktionary
context menu
n. (context computing graphical user interface English) A context-sensitive menu.
Wikipedia
Context menu
A context menu (also called contextual, shortcut, and popup or pop-up menu) is a menu in a graphical user interface (GUI) that appears upon user interaction, such as a right-click mouse operation. A context menu offers a limited set of choices that are available in the current state, or context, of the operating system or application. Usually the available choices are actions related to the selected object. From a technical point of view, such a context menu is a graphical control element.