Stationary means not moving.
- The car remained stationary.
- The cyclist kept the bicycle stationary.
Stationery means writing materials such as paper, envelopes and pens.
- I bought some new stationery.
- The office ordered printed stationery.
- She designs personalised stationery.
Easy way to remember
Stationery contains e, like envelope.
Stationary = not moving
Stationery = writing materials