unknown

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unknown

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

unknown

i. A code meaning the information is not available.
ii. An unidentified target.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in classic literature ?
The bride and bridegroom talk and laugh apart, as has always been their manner; and the Buffers work their way through the dishes with systematic perseverance, as has always been THEIR manner; and the pokey unknowns are exceedingly benevolent to one another in invitations to take glasses of champagne; but Mrs Podsnap, arching her mane and rocking her grandest, has a far more deferential audience than Mrs Veneering; and Podsnap all but does the honours.
Did an atmosphere, then, bring to this unknown face its life-giving atoms?
All eyes were turned towards this man--for to all except Athos he was unknown.
Although the stranger's name and rank were unknown to Rosalie's father, he was really the son of the King of the Golden Isle, which had for capital a city that extended from one sea to another.
A gesture of the unknown interrogated him, without a word being pronounced.
The cub knew only that the sniff was strange, a something unclassified, therefore unknown and terrible-- for the unknown was one of the chief elements that went into the making of fear.
"Why, then, do you introduce scientific questions if you have never studied them?" asked the unknown somewhat coarsely.
But the columns advanced for a long time, always in the same fog, descending and ascending hills, avoiding gardens and enclosures, going over new and unknown ground, and nowhere encountering the enemy.
My mother did not relish this at all, and now made many objections to my accepting the situation; in which my sister warmly supported her: but, unwilling to be balked again, I overruled them all; and, having first obtained the consent of my father (who had, a short time previously, been apprised of these transactions), I wrote a most obliging epistle to my unknown correspondent, and, finally, the bargain was concluded.
The more attentively Kitty watched her unknown friend, the more convinced she was this girl was the perfect creature she fancied her, and the more eagerly she wished to make her acquaintance.
Since it is easier to endure the known than to fly to the unknown; since both misery and fear love company; the apparent easiest thing for Jerry to have done would have been to follow the tribe of Somo into its fastnesses.
And then he said--not bitterly--that he would die as he had lived, forgotten and unknown. He maintained that resolution to the last.