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1. Communication by the exchange of messages (letters, e-mails, etc.)
    
2. Compatibility of observations
   "the results of two tests were in correspondence";
   - agreement
    
3. The relation of corresponding in degree, size or amount
   - commensurateness, proportionateness
    
4. (mathematics) an attribute of a shape or relation; exact reflection of form on opposite sides of a dividing line or plane
   - symmetry, symmetricalness, balance
    
5. Similarity by virtue of corresponding
   - parallelism

Sounds like: correspondents

Derived forms: correspondences

Type of: 1st class, 1st-class mail, black and white, compatibility, first class, first-class mail, proportionality, similarity, spatial property, spatiality, written communication, written language

Encyclopedia: Correspondence