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Noun
1. a person or thing having the same function or characteristics as another
(synonym) counterpart, opposite number
(hypernym) equivalent
(hyponym) match
2. small sofa that seats two people
(synonym) love seat, tete-a-tete
(hypernym) sofa, couch, lounge

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Adverb
1. face-to-face; face-to-face with; "they sat vis-a-vis at the table"; "I found myself vis-a-vis a burly policeman"

n. vis-a-vis, (French); opposite number

n. vis-à-vis, one who is opposed

(n.)
One who, or that which, is face to face with another; esp., one who faces another in dancing.
  

(n.)
A carriage in which two persons sit face to face. Also, a form of sofa with seats for two persons, so arranged that the occupants are face to face while sitting on opposite sides.
  

(adv.)
Face to face.