The word meaning of stationary is something that doesn't move or not intended to be moved.
When it is used in a passage it literally means something that doesn't have any motion or something that doesn't intend to move.
It means its quantity or quantity will not change.
If the word is used in relation to a human, it might mean that the man is shocked and isn't moving.
In common conversation, stationery is a noun that is used to refer to something used in school and offices to write. Examples are paper, pens, paper clips, markers, scale, etc.