1PM to send someone in the military to a particular place for a period of time as part of their military duty [= post]:
I was stationed overseas at the time.
I was stationed overseas at the time.2 formal to move to a particular place and stand or sit there, especially in order to be able to do something quickly, or to cause someone to do this :
A security guard was stationed near the door.
A security guard was stationed near the door.