Present participle of appertain; belonging to or being connected with something.
The present participle form of 'appertain,' created by adding '-ing' to the verb. Functions as a verb form or adjective describing something that belongs or relates to something else.
You see this constantly in formal language: 'all matters appertaining to the contract'—it's the legal/formal way to say 'relating to' or 'connected with,' especially when listing what falls under something's scope.
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