## Etymology
From decide plus the suffix -able. Decide is from Old French decider, from Latin dēcīdere ('to cut off, decide'), from de- ('off') plus caedere ('to cut').

## AI Etymology
Decidable is from decide plus the suffix -able. Decide is from Old French decider, from Latin dēcīdere ('to cut off, decide'), from de- ('off') 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 -able forms an adjective of capability or suitability, so the English form is shaped by recognizable word formation as well as by its inherited or borrowed base. In present use as an adjective, it means "able to be decided; in logic, solvable by an algorithm", keeping the historical formation close to the word's ordinary semantic work. Related words include decide, decision, and decisive; derived forms include decidability.

## Topics
- Technology & Computing
- Word Formation & Derivatives

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