How do you spell Stagnate

Available Definitions:
1)  v. t. - To cease to flow; to be motionless; as, blood stagnates in the veins of an animal; hence, to become impure or foul by want of motion; as, air stagnates in a close room.
2)  v. t. - To cease to be brisk or active; to become dull or inactive; as, commerce stagnates; business stagnates.
3)  a. - Stagnant.