un known

unknown

[uhn-nohn]
adjective
1.
not known; not within the range of one's knowledge, experience, or understanding; strange; unfamiliar.
2.
not discovered, explored, identified, or ascertained: the unknown parts of Antarctica.
3.
not widely known; not famous; obscure: an unknown writer.
noun
4.
a thing, influence, area, factor, or person that is unknown: the many unknowns in modern medicine; The director cast an unknown in the leading role.
5.
Mathematics. a symbol representing an unknown quantity: in algebra, analysis, etc., frequently represented by a letter from the last part of the alphabet, as x, y, or z.

Origin:
1250–1300; Middle English unknow(e)n. See un-1, known

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World English Dictionary
unknown (ʌnˈnəʊn)
 
adj
1.  not known, understood, or recognized
2.  not established, identified, or discovered: an unknown island
3.  not famous; undistinguished: some unknown artist
4.  unknown quantity a person or thing whose action, effect, etc, is unknown or unpredictable
 
n
5.  an unknown person, quantity, or thing
6.  maths a variable, or the quantity it represents, the value of which is to be discovered by solving an equation; a variable in a conditional equation: 3y = 4x + 5 is an equation in two unknowns
 
un'knownness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

unknown
c.1300, "strange, unfamiliar" (of persons, places), from un- (1) "not" + pp. of know. Cf. O.E. ungecnawen. In ref. to facts, attested from early 14c. The noun meaning "unknown person" is recorded from 1590s.
Online Etymology Dictionary, © 2010 Douglas Harper
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