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Definition of Dropdown
1. Adjective. (context: computing of a widget) Dropping down from above; a specific type of selection object (GUI or CHUI) that hides the display of its contents until activated. ¹
2. Noun. (graphical user interface) An instance of a selection object that hides the contents (especially the other choices) until activated. ¹
¹ Source: wiktionary.com