Source : Webster's Revised Unabridged Dictionary (1913)

Correspondence \Cor`re*spond"ence\ (-sp?nd"ens), n. [Cf. F.
   correspondance.]
   1. Friendly intercourse; reciprocal exchange of civilities;
      especially, intercourse between persons by means of
      letters.

            Holding also good correspondence with the other
            great men in the state.               --Bacon.

            To facilitate correspondence between one part of
            London and another, was not originally one of the
            objects of the post office.           --Macaulay.

Source : WordNet®

correspondence
     n 1: communication by the exchange of letters
     2: compatibility of observations; "there was no agreement
        between theory and measurement"; "the results of two tests
        were in correspondence" [syn: {agreement}]
     3: the relation of correspondence in degree or size or amount
        [syn: {commensurateness}, {proportionateness}]
     4: a function such that for every element of one set there is a
        unique element of another set [syn: {mapping}, {map}]
     5: communication by exchange of letters
     6: (mathematics) an attribute of a shape or relation; exact
        correspondence of form on opposite sides of a dividing
        line or plane [syn: {symmetry}, {symmetricalness}, {balance}]
        [ant: {asymmetry}]
     7: similarity by virtue of correspondence [syn: {parallelism}]