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en.wikipedia.org/wiki/Variable_(mathematics)

In elementary mathematics, a variable is an alphabetic character representing a number, called the value of the variable, which is either arbitrary, not fully specified, or unknown. .... In the same context, the variables that are independent of x define constant functions and are therefore called constant. For example, a constant ...

en.wikipedia.org/wiki/Cancer_of_unknown_primary_origin

Cancer of unknown primary origin (CUP, "occult cancer") is a cancer that is determined to be at .... From 1980 to 1990, definition of unknown primary cancer was based on imaging results. Subsequently, research on immunohistochemistry  ...

en.wikipedia.org/wiki/Software_of_unknown_pedigree

SOUP stands for software of unknown (or uncertain) pedigree (or provenance), and is a term often used in the context of safety-critical and safety-involved ...

www.dictionary.com/browse/unknown

Unknown definition, not known; not within the range of one's knowledge, experience, or understanding; strange; unfamiliar. See more.

en.wikipedia.org/wiki/There_are_known_knowns

"There are known knowns" is a phrase from a response United States Secretary of Defense ... But there are also unknown unknowns – the ones we don't know we don't know. And if one looks throughout the history of our country and other free ...

www.merriam-webster.com/dictionary/unknown

Define unknown: not known or not well-known; also : having an unknown value — unknown in a sentence.

www.thesaurus.com/browse/unknown

Synonyms for unknown at Thesaurus.com with free online thesaurus, antonyms, and definitions. Dictionary and Word ... unknown. star. see definition of unknown.

www.powerthesaurus.org/unknown/define

The list of Unknown definitions helps to quickly define Unknown and get the meaning with synonyms and sample usage.

www.thefreedictionary.com/unknown

Not known; unfamiliar: a problem unknown in earlier times. 2. Not identified, ascertained, or established: received flowers from an unknown admirer. 3. Not well ...