How do you spell Respiration

Available Definitions:
1)  n. - The act of respiring or breathing again, or catching one's breath.
2)  n. - Relief from toil or suffering: rest.
3)  n. - Interval; intermission.
4)  n. - The act of resping or breathing; the act of taking in and giving out air; the aggregate of those processes bu which oxygen is introduced into the system, and carbon dioxide, or carbonic acid, removed.