Noah Webster's New International Dictionary of the English Language

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.