1

unknown

adjective un·known \ ˌən-ˈnōn \
Updated on: 20 Nov 2017

Definition of unknown

: not known or not well-known; also : having an unknown value
  • an unknown quantity

Examples of unknown in a Sentence

  1. a disease of unknown cause

  2. Much remains unknown about his early life.

  3. Her music was previously unknown outside of Asia.

  4. An unknown number of cases go unreported.

  5. The victim's attacker was unknown to her.

  6. For some unknown reason, my computer crashed.

  7. a book of unknown poems

Recent Examples of unknown from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unknown.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of unknown

14th century


2

unknown

noun

Definition of unknown

1 : one that is not known or not well-known; especially : a person who is little known (as to the public)
2 : something that requires discovery, identification, or clarification: such as
a : a symbol (such as x, y, or z) in a mathematical equation representing an unknown quantity
b : a specimen (as of bacteria or mixed chemicals) required to be identified as an exercise in appropriate laboratory techniques

Examples of unknown in a Sentence

  1. explorers venturing off into the unknown

  2. A fear of the unknown kept her from changing jobs.

  3. The director cast an unknown in the lead role.

  4. We're facing too many unknowns.

Recent Examples of unknown from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'unknown.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of unknown

1597



UNKNOWN Defined for English Language Learners

unknown

adjective

Definition of unknown for English Language Learners

  • : not known

  • : not well-known : not famous


unknown

noun

Definition of unknown for English Language Learners

  • the unknown : a place, situation, or thing that you do not know about or understand

  • : a person who is not famous or well-known

  • : something that is not known or not yet discovered


UNKNOWN Defined for Kids

1

unknown

adjective un·known \ ˌən-ˈnōn \

Definition of unknown for Students

: not known
  • … it was cut all over with strange lines and figures that might be the letters of an unknown language.
  • —C. S. Lewis, The Lion, the Witch and the Wardrobe

2

unknown

noun

Definition of unknown for Students

: one (as a quantity) that is unknown


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