Definitions

1. adjective

not open to the public or available for general use

“The nonpublic data of the company was leaked to the media.”

2. noun

a program or system that is not open to the public

“The university has a nonpublic computer network for students.”

3. adverb

in a way that is not open to the public

“The nonpublic meeting of the board of directors was held in secret.”