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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Example sentences
Pain can be mysterious, untreatable and debilitating, and its causes can be
  unknown.
Percentages do not include faculty members whose race was unknown.
Scientists say the underwater hotspots may potentially host unique forms of
  life previously unknown to science.
But the creatures unearthed also include eight taxa previously unknown to
  science.
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