British spelling of dogmatizing; the act of stating something as absolute truth or converting beliefs into rigid, unquestionable doctrine.
From dogmatise + -ing (present participle). The -ing form is universal across all English dialects, making it one of the most stable verb forms.
The present participle '-ing' form is so ancient that it survives identically in both American and British English—it's from Old English -ung and is over 1000 years old!
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