Word Origin & History
demerit1399, from O.Fr. desmerite, from des- "not, opposite" + merite "merit." L. demereri meant "to merit, deserve," from de- in its completive sense. But M.L. demeritum meant "fault." Both senses existed in the M.Fr. form of the word. Meaning "penalty point in school" is attested from 1862.