vis-à-vis

from The American Heritage® Dictionary of the English Language, 5th Edition.

• preposition Face to face with; opposite to.
• preposition Compared with.
• preposition In relation to.
• adverb Face to face.
• noun One that is face to face with or opposite to another.
• noun A date or an escort, as at a party.
• noun One that has the same functions and characteristics as another; a counterpart.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• preposition In relation to; compared with;
• preposition Opposite, across from, set so as to be facing.
• noun historical A small horse-drawn carriage for two people sitting facing each other.
• noun One of two (or more) people facing or opposite each other during a formal dance, at a dinner table etc.
• noun A date or escort in a social event.
• noun A person holding a corresponding position in another organisation; a counterpart.
• adjective face-to-face
• adjective in relation to
• adjective numismatics, of a coin having two portraits facing each other
• adverb face to face (with another)
• adverb archaic In a position facing a specified or implied subject.