The phrase 'vis-a-vis' is in French. It means face-to-face. In the word-by-word translation, the noun 'vis' means 'face'. The preposition 'a' means 'to'.
The word 'vis' means force, power. It's a feminine gender noun. It's in the singular form of the nominative case as the subject of the sentence, or of the genitive case meaning of force/power.