How do you spell Quiescent

Available Definitions:
1)  a. - Being in a state of repose; at rest; still; not moving; as, a quiescent body or fluid.
2)  a. - Not ruffed with passion; unagitated; not in action; not excited; quiet; dormant; resting.
3)  a. - Not sounded; silent; as, y is quiescent in "day" and "say."
4)  n. - A silent letter.