## Etymology
From decided (past participle of decide) plus the adverbial suffix -ly. Decide is from Latin dēcīdere ('to cut off, decide'), from de- plus caedere ('to cut').

## AI Etymology
Decidedly is from decided (past participle of decide) plus the adverbial suffix -ly. Decide is from Latin dēcīdere ('to cut off, decide'), from de- plus caedere ('to cut'). The ancestry passes through Latin dēcīdere and Latin caedere. The prefix de- often marks removal, reversal, or downward motion in Latin formations, helping to explain the word's surface structure; the suffix -ly forms an adverb or adjective from the base, so the English form is shaped by recognizable word formation as well as by its inherited or borrowed base. In present use as an adverb, it means "definitely and unmistakably", keeping the historical formation close to the word's ordinary semantic work. Related words include decided, decide, and decision.

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- Describing Qualities
- Word Formation & Derivatives

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