How do you spell Invisible

Available Definitions:
1)  a. - Incapable of being seen; not perceptible by vision; not visible.
2)  n. - An invisible person or thing; specifically, God, the Supreme Being.
3)  n. - A Rosicrucian; -- so called because avoiding declaration of his craft.
4)  n. - One of those (as in the 16th century) who denied the visibility of the church.