
gleichnamig
same-named
Bearing the same name.
Der Film basiert auf dem gleichnamigen Roman von 1995.
The film is based on the 1995 novel of the same name.
same-named / eponymous
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same-named
Bearing the same name.
Der Film basiert auf dem gleichnamigen Roman von 1995.
The film is based on the 1995 novel of the same name.

parallel
In music, describing a key that has the same tonic but a different mode, such as C major and C minor.
Das Stück moduliert von der Dur-Tonart in die gleichnamige Moll-Tonart.
The piece modulates from the major key into the parallel minor key.

with common denominators
In mathematics, having the same denominator when referring to fractions.
Um diese beiden Brüche zu addieren, musst du sie zuerst gleichnamig machen.
To add these two fractions, you first have to give them common denominators.
The word is a compound of 'gleich' (same) and '-namig' (from 'der Name', name). So it literally means 'having the same name'.
In meiner Klasse gibt es zwei gleichnamige Schüler.
There are two students with the same name in my class.
This adjective is almost always used attributively, that is, directly before a noun. The predicative form ('Der Roman ist gleichnamig', the novel is same-named) is very rare and sounds unnatural.
Die Band spielte einen Song aus ihrem gleichnamigen Debütalbum.
The band played a song from their debut album of the same name.
The general meaning is used in everyday language. The meanings in music and mathematics are technical language and are only understandable in their respective contexts.
Um die Brüche zu addieren, müssen wir sie erst gleichnamig machen.
To add the fractions, we first have to give them common denominators.
In the general meaning, 'gleichnamig' (same-named/of the same name) very often refers to media or works of art that are based on another source.
Ich habe zuerst das Buch gelesen und mir dann den gleichnamigen Film angesehen.
I read the book first and then watched the film of the same name.
consistent / unanimous
Gleichnamig and übereinstimmend can both apply to two things that are the same in a particular respect. Gleichnamig refers specifically to having the same name, while übereinstimmend describes equality or great similarity in content. Use gleichnamig for names and übereinstimmend for information, statements, or results.

Die beiden Straßen sind gleichnamig und liegen in verschiedenen Stadtteilen.
The two streets have the same name and are in different neighborhoods.
Die Angaben der beiden Zeugen waren in den wichtigen Punkten übereinstimmend.
The two witnesses' accounts were consistent on the important points.