not known; not within the range of one's knowledge, experience, or understanding; strange; unfamiliar.
not discovered, explored, identified, or ascertained: the unknown parts of Antarctica.
not widely known; not famous; obscure: an unknown writer.
noun
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.
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 of unknown
First recorded in 1250–1300, unknown is from the Middle English word unknow(e)n.See un-1, known
Finally, we plot this percentage of clicks going to unknown search terms by day, allowing you to easily see if there are any big changes coming out of the Googleplex.
How much does Google’s new search term filtering affect ad spend transparency? Here’s how to find out|Frederick Vallaeys|September 16, 2020|Search Engine Land
Whether Apple’s rumored new premium fitness offering, with virtual workouts and coaching, will appear as part of a bundle is unknown, but it could link with the introduction of the new Apple Watch.
Apple’s ‘Time Flies’ event: 5 things to look for|Aaron Pressman|September 15, 2020|Fortune
It leads to what Firestein calls “the portal of the unknown.”
A secret of science: Mistakes boost understanding|Rachel Kehoe|September 10, 2020|Science News For Students
Multiple trustworthy outlets, citing unknown people familiar with his comments, report that he’s said some disturbing things about the military and those who serve in uniform.
Did Trump call US war dead “losers” and “suckers”? The controversy, explained.|Alex Ward|September 4, 2020|Vox
That means an unknown but likely significant number of those 315,000 applicants will not naturalize soon enough to register by October and vote in November.
New U.S. Citizens Were One Of The Fastest-Growing Voting Blocs. But Not This Year.|Eileen Guo|August 31, 2020|FiveThirtyEight
While Faal and Njie are in U.S. custody, the whereabouts of the other survivors is unknown.
The Shadowy U.S. Veteran Who Tried to Overthrow a Country|Jacob Siegel|January 6, 2015|DAILY BEAST
The police suspect that the other unaccounted for 643,000 bitcoins, were removed from customer accounts via an unknown party.
Japanese Bitcoin Heist ‘an Inside Job,’ Not Hackers Alone|Nathalie-Kyoko Stucky, Jake Adelstein|January 1, 2015|DAILY BEAST
Until recently, the hacker collective known as Lizard Squad was all but unknown.
The Attack on the Hidden Internet|Marc Rogers|December 29, 2014|DAILY BEAST
I believe that my case is being interfered with by unknown elements inside Iran.
An American Marine in Iran’s Prisons Goes on Hunger Strike|IranWire|December 18, 2014|DAILY BEAST
We are not concerned or jittered about an unknown candidate.
The common serpent was unknown to us; but with our voices alone we managed to make a formidable noise.
Christmas Stories from French and Spanish writers|Antoinette Ogden
Determination and efficiency are not unknown in His Majesty's Navy.
The Blocking of Zeebrugge|Alfred F. B. Carpenter
The defendant's whereabouts were unknown to us, your Honor, and the court allowed us to serve notice by publication.
Lightnin'|Frank Bacon
The byssus is unknown to us, but the stuffs of Lyons are more valuable.
A Philosophical Dictionary, Volume 1 (of 10)|Franois-Marie Arouet (AKA Voltaire)
To those who hold this opinion, the system of reverberating praise from one journal to another, must be unknown.
The American Quarterly Review|Various
British Dictionary definitions for unknown
unknown
/ (ʌnˈnəʊn) /
adjective
not known, understood, or recognized
not established, identified, or discoveredan unknown island
not famous; undistinguishedsome unknown artist
unknown quantitya person or thing whose action, effect, etc, is unknown or unpredictable
noun
an unknown person, quantity, or thing
mathsa variable, or the quantity it represents, the value of which is to be discovered by solving an equation; a variable in a conditional equation3y = 4x + 5 is an equation in two unknowns