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

unknown

i. A code meaning the information is not available.
ii. An unidentified target.
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?
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.
Your weakness amounts to folly," retorted the unknown in a passion.
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.
A shudder crept through the judges at the revelation of these unknown crimes.
One day the King, more sorrowful than usual, was walking sadly along the sea-shore, when after a long silence the unknown Prince, who was his only companion, suddenly spoke.
Yet what Jerry did was to diverge from the line of retreat and to start northward, across the bounds of Somo, and continue northward into a strange land of the unknown.
And then he said--not bitterly--that he would die as he had lived, forgotten and unknown.