The built-in touch-to-define feature in iOS is an easy way for a student to access the meaning of a word in the context of reading. Membean has been a great tool, too, for expanding my students' vocabulary, but recently I discovered that the Dictionary.com App has an accompanying widget that appears in iOS's notification screen.
The Dictionary.com widget will display a word and three possible meanings. Users can access the widget by swiping down from the top of the screen to reveal the notifications panel, answer the multiple choice question, and retrieve another question. A simple swipe up hides the notifications.
The widget is hidden until you "Edit" your notifications panel. To do this, swipe down from the top of the screen, scroll to the bottom of the panel, and select "Edit." All apps that support widgets will appear, and you can toggle them off and on.
Sometimes navigating to an app and loading it can take 5-10 seconds. With notifications, a simple swipe-down reveals the question-of-the-day from Dictionary.com. Students can answer 2 or 3 questions in that same 5-10 seconds during down time between classes, on the morning commute, or whenever.