Your mother has probably more than once asked you for quietude even if she hasn't used the word. Quietude means a state of peace and quiet. It goes hand in hand with solitude.
Quietude is a word that is used less and less, as we seem to have less time and space for it. A park used to be a good place to find quietude, but with cell phones, you're likely to begin chatting even when no one else is around. If you really want quietude, you might try a library, or a chapel. Meditation can be used to bring you a moment of quietude wherever you are. Try it now. Ohhhmmm. Ohhhmmm. Ohhhmmm.