known
/nou/
Definition
Adjective 1. Recognized, familiar, or understood: Something or someone that is "known" has been perceived, learned about, or identified with certainty. It is the opposite of unknown or unfamiliar. 2. Publicly acknowledged or famous: A person, fact, or thing that is widely recognized or acknowledged by many people.
Usage and Examples
- As an adjective describing a fact or piece of information:
- It is a known fact that water boils at 100°C. (This information is established and accepted.)
- The side effects of the medication are well known. (The effects are widely understood.)
- As an adjective describing a person or thing:
- He is a known expert in the field. (He is a recognized and acknowledged expert.)
- She used a known technique to solve the problem. (She used a familiar, established method.)
- Common patterns:
- to be known for something: To be famous or recognized because of a particular quality or achievement.
- The city is known for its beautiful architecture.
- to be known as something: To be called or identified by a particular name or title.
- She is known as a fair and honest leader.
- to make something known: To announce or reveal information publicly.
- The company made its decision known to the employees.
Advanced Usage
- Known quantity: A person or thing whose characteristics, abilities, or effects are already understood and predictable.
- In this project, we prefer to work with known quantities.
- Known unknown: A concept acknowledging that one is aware of a gap in their knowledge. (A formal term often used in analysis.)
- We have identified several known unknowns that require further research.
Variants and Related Words
- Know (verb): To have information about, to be familiar with, or to recognize someone or something.
- I know the answer.
- Unknown (adjective): Not known or familiar.
- The cause of the phenomenon is still unknown.
- Well-known (adjective): Widely or fully known; famous. (Note: This is a compound adjective listed here as a related form).
- He is a well-known author.
Synonyms
- Recognized
- Familiar
- Established
- Identified
- Acknowledged
- Famous (for the sense of public recognition)
Antonyms
- Unknown
- Unfamiliar
- Unidentified
- Obscure
Related Phrases and Idioms
- Let it be known: To make sure information is communicated to others.
- He let it be known that he would not be running for office again.
- Known to the police: A person who has a criminal record or is familiar to law enforcement.
- The suspect was already known to the police.
Adjective
-
apprehended with certainty
-
a known quantity
-
the limits of the known world
-
a musician known throughout the world
-
a known criminal
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