What does "known" mean?

1. (familiar or recognized) familiar to people or easy to recognize. 2. (famous for something) famous or well-regarded for a specific reason. 3. (a fixed value) something that is already certain or a value that is already calculated.

known

adj. · n.

US //ˈnoʊn// UK //nˈəʊn// known

1 familiar or recognized (adj.)
A2 Elementary

familiar to people or easy to recognize.

familiar, recognized, or established through experience or observation.

Example

It is a known fact that smoking is bad for your health.

Example

The patient had no known allergies to the medication, so the doctor proceeded with the standard prescription.
- unknown
- unfamiliar
2 famous for something (adj.)
B1 Intermediate

famous or well-regarded for a specific reason.

widely recognized or famous, often followed by 'as' or 'for'.

Example

The city is known for its beautiful parks and old buildings.

Example

The author is primarily known for her historical novels, though she has recently experimented with science fiction.
- obscure

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3 a fixed value (n.)
C1 Advanced Technical Math

something that is already certain or a value that is already calculated.

a fact or variable whose value or nature is already determined or established.

Example

In this equation, the speed of the car is a known.

Example

When solving for the trajectory, we must first isolate the knowns from the variables to simplify the calculation.
- constant
- certainty
- unknown
- variable

Origin

From Middle English knowen, from Old English cnāwen (past participle). Morphologically know + -n.