Present participle of comprise; the act of including or consisting of as parts.
From 'comprize' with the -ing suffix added to create the gerund/present participle form, maintaining the root from Old French 'comprendre'.
The -ing form of 'comprise' is rarely used compared to other verbs, probably because we don't often need to talk about the continuous or ongoing act of comprising something. It's grammatically correct but feels awkward to native speakers!
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