A suffix is the part of a word that is positioned, usually at the end, after the root of the word.
In the case of the word "fallacy", the suffix is the affix "acy", which comes from Latin and means quality, state or condition. However, when this suffix joins the prefix "fall" forming the word "fallacy" we have a concrete meaning like "without being false." "Someone who does something false." "The state of being false." "Having the misfortune of being false." This is because the word "fallacy" represents an incoherent argument, which seems correct, but it is not.
