Definition of unknown quantity
- If you've never been published before, you're an unknown quantity, so you're going to have difficulty selling your first novel.
: 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
: an indefinite amount or number
: a determinate or estimated amount
: total amount or number
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