of or pertaining to
Something that is mundane is very ordinary and not interesting or exciting, especially because it happens very often.
An idea or remark is germane to a situation if it is connected to it in an important or fitting way.
If you behave in an urbane way, you are behaving in a polite, refined, and civilized fashion in social situations.
Something that is arcane is mysterious and secret, known and understood by only a few people.
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