similarity
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similarity
The presence of shared features, characteristics, or traits between two or more people, things, or concepts that make them comparable.
Die Ähnlichkeit zwischen den beiden Schwestern ist verblüffend.
The similarity between the two sisters is astonishing.
'Die Ähnlichkeit' (similarity) is the noun corresponding to the adjective 'ähnlich' (similar). The ending '-keit' is a typical way to form nouns from adjectives that describe a quality or state.
Die beiden Brüder sehen sich sehr ähnlich.
The two brothers look very similar.
To express what is similar, two constructions are used: 'die Ähnlichkeit zwischen A und B' (the similarity between A and B, with dative) or 'die Ähnlichkeit mit C' (the similarity to C, with dative).
Ich sehe eine große Ähnlichkeit zwischen dir und deinem Vater.
I see a strong similarity between you and your father.
The word is often combined with adjectives that describe the degree of similarity. Common combinations are 'eine große Ähnlichkeit' (a strong similarity), 'eine geringe Ähnlichkeit' (a slight similarity), or 'eine verblüffende Ähnlichkeit' (an astonishing similarity).
Es gibt nur eine geringe Ähnlichkeit zwischen dem Original und der Fälschung.
There is only a slight similarity between the original and the forgery.
difference
'Unterschied' and 'Ähnlichkeit' are clear opposites. An 'Unterschied' shows what makes two people, things, or situations different. An 'Ähnlichkeit' shows what they have in common or why they seem comparable. Both words are used when comparing, but they look in different directions: 'Unterschied' asks about what is different, while 'Ähnlichkeit' asks about what is shared.
Frau Becker sprach im Gespräch über die Ähnlichkeit zwischen den zwei Produkten.
In the conversation, Ms. Becker talked about the similarity between the two products.
Auf der Feier ist mir der Unterschied zwischen den beiden Brüdern sofort aufgefallen.
At the party, I immediately noticed the difference between the two brothers.