unknown

Unknown means something that people are not aware of or familiar with.

(adjective)

A brand new taste that you have never tasted before is an example of something that you would describe as an unknown taste.

The definition of an unknown is a person or thing that you are not familiar with, or a variable in a math problem for which you are trying to solve.

(noun)

An actor no one has ever heard of who is trying to get into the movie business is an example of an unknown.
In the equation "x+2 = 4," x is an example of an unknown.

See unknown in Webster's New World College Dictionary

adjective

not known; specif.,

not in the knowledge, understanding, or acquaintance of someone; unfamiliar (to)
not discovered, identified, determined, explored, etc.

noun

See unknown in American Heritage Dictionary 4

adjective

Not known; unfamiliar: a modern-day problem unknown in earlier times.
a. Not identified or ascertained: received flowers from an unknown admirer.
b. Not established or verified.
Not well known or widely known: an unknown artist.

noun

a. A person or thing that is unknown: “the abyss of the unknown” (Helena Petrovna Blavatsky).
b. A person who is not well known, as to the general public: cast an unknown in the starring role.
Mathematics A quantity of unknown numerical value.

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