[Petronski]

From Miriam Webster:
Main Entry: ver·sus
Pronunciation: \ˈvər-səs, -səz\
Function: preposition
Etymology: Middle English, from Medieval Latin, towards, against, from Latin, adverb, so as to face, from past participle of vertere to turn Date: 15th century
1 : against
2 : in contrast to or as the alternative of (free trade versus protection)