noun
fact, truth
B1
Tatsache (die) means a fact or reality, sometimes 'truth'. It’s a feminine noun with plural Tatsachen. Use the definite article die/Tatsachen in plural. Declensions: die Tatsache (Nom.Sg.), die Tatsachen (Nom.Pl.); genitive plural der Tatsachen. Common in formal and spoken contexts.
Examples
Es ist eine Tatsache, dass die Erde rund ist.
It is a fact that the Earth is round.
Die Tatsache, dass er nicht gekommen ist, überrascht mich.
The fact that he didn't come surprises me.
Der Historiker betonte die Tatsache, weil die Quellen übereinstimmten.
The historian emphasized the fact because the sources agreed.
Details
Mnemonics
Imagine a stamped document with the word FACT across it — that's a Tatsache.
Tatsache — think 'tat-sah-khe' and associate with the English 'fact'.
Feminine (die): picture a bold headline 'Die Tatsache' on a newspaper.
Notes
Used to state objective information; common in formal and journalistic contexts ('Die Tatsache ist, ...').