(noun) An invisible person or thing; specifically, God, the Supreme Being.
"Like a shadow, I am and I am not."
"The soul takes flight to the world that is invisible but there arriving she is sure of bliss and forever dwells in paradise."
"The nicest feeling in the world is to do a good deed anonymously-and have somebody find out."
"Invisible threads are the strongest ties."
"Wonder Woman is lame. She flies around in an invisible jet, but she's not invisible. I don't get it."