certainty
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certainty
The state of being completely sure about something and having no doubts.
Nach dem Anruf hatte er endlich die Gewissheit, dass seine Bewerbung erfolgreich war.
After the phone call, he finally had certainty that his application had been successful.
'Die Gewissheit' (certainty) is the noun related to the adjective 'gewiss' (certain), which means 'sicher' (sure/certain). The ending '-heit' turns an adjective into an abstract noun that describes a state.
Es ist gewiss, dass die Sonne morgen wieder aufgeht.
It is certain that the sun will rise again tomorrow.
'Gewissheit' (certainty) is very often used with a subordinate clause introduced by 'dass' (that). The structure is often: 'die Gewissheit haben/bekommen, dass ...' (to have/get the certainty that ...).
Ich habe die Gewissheit, dass alles gut werden wird.
I have the certainty that everything will turn out well.
Typical verbs used with 'Gewissheit' (certainty) are 'Gewissheit haben' (to have certainty), 'Gewissheit erlangen' (to gain certainty), or 'sich Gewissheit verschaffen' (to make sure/find out for certain).
Der Detektiv wollte sich endlich Gewissheit verschaffen.
The detective finally wanted to find out for certain.
In the meaning of 'certain fact,' the word is often used in the plural to talk about basic, unshakable facts of life or of a situation.
Es gibt im Leben nur wenige Gewissheiten.
There are only a few certainties in life.
safety / certainty / security
'die Sicherheit' and 'die Gewissheit' can be very similar when it comes to having no doubts. Both express that you consider something certain or reliable. 'Gewissheit' fits especially well when you are completely sure internally or when a fact is established. 'Sicherheit' is a little broader and can also mean protection from danger; in this relation, however, it is about the meaning 'no doubts'. In sentences like 'mit großer Sicherheit' (with great certainty) and 'mit Gewissheit' (with certainty), the words are very close to each other.
Er brauchte Gewissheit, bevor er den Mietvertrag unterschrieb.
He needed certainty before signing the rental contract.
Nach der Antwort der Behörde hatte sie endlich Sicherheit.
After the authority's reply, she finally had certainty.