known
known · knowns
Any fact or situation which is known or familiarAny fact or situation which is known or familiar.
UK/nəʊn/US/noʊn/
Meaning
2 sensesAny fact or situation which is known or familiar.
You have to tell the knowns from the unknowns.
A constant or variable the value of which is already determined.
Origin
From Middle English knowen, from Old English cnāwen (past participle).From Middle English knowen, from Old English cnāwen (past participle).
Wiktionary, CC BY-SA 4.0 · source