Definition of the unknown
- explorers venturing off into the unknown
- A fear of the unknown kept her from changing jobs.
: not known or not well-known
: one that is not known or not well-known
: something that requires discovery, identification, or clarification: such as
: a symbol (such as x, y, or z) in a mathematical equation representing an unknown quantity
What made you want to look up the unknown? Please tell us where you read or heard it (including the quote, if possible).