a for·ti·o·ri /ˌā-ˌfȯr-shē-'ōr-ˌī, ˌä-ˌfȯr-shē-'ōr-ē, -ˌfȯr-tē-/ 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)
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.