a fortiori adv[New Latin, from the stronger (argument)]
: all the more certainly
: with greater reason
: with still more convincing force used in drawing a conclusion that is thought to be even more certain than another [the evident purpose of the latter statute — to provide a distinct and more severe sentencing scheme for violent habitual offenders — plainly suggests that the Legislature intended it to apply a fortiori , to murderers as well as to criminals who commit other violent, but less serious, felonies "People v. Jenkins , 893 P.2d 1224 (1995)"]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.