A mistaken belief, especially based on an unsound argument

Base and Suffix of the Word

Fall- The root of fall means trick.

Acy- A suffix of nouns of quality, state, office, etc.

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How Fall and -Acy Have Become a New Noun

The root fall, meaning trick, was joined with -acy which led to the definition of the suffix and root being slightly modified to the definition of fallacy, a mistaken belief.
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