Plural of deprecation; earnest expressions of disapproval, protest, or pleading against something.
From deprecate + -tion (noun-forming suffix from Latin -tio). The -tion suffix is one of English's most productive, creating nouns from verbs.
The -tion suffix is so common (action, creation, nation, station) that it's practically the default way English turns verbs into nouns, accounting for thousands of words.
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