Here are some examples:
* A stationary bike: This bike is designed to stay in one place while you pedal.
* A stationary object: A rock on the ground is a stationary object because it's not moving.
* A stationary front: In meteorology, a stationary front is a boundary between two air masses that is not moving.
Other ways to say "stationary":
* Still
* Immobile
* Fixed
* Unmoving
* Static
Let me know if you'd like more examples or have any other questions!