名詞 vis-a-vis:

1. a person or thing having the same function or characteristics as another
   同義詞：counterpart, opposite number
2. small sofa that seats two people
   同義詞：love seat, loveseat, tete-a-tete

副詞 vis-a-vis:

1. face-to-face; face-to-face with

1. Women's salaries are low vis-a-vis what men earn for the same work.
   女子的薪水比同工種的男子低。
2. His salary vis-a-vis the national average is extremely high.
   他的薪水比起全國平均水平高出很多。