correspondence

1. Communication by the exchange of letters (synset 106636121)
   is a type of:

   • 1st class, 1st-class mail, first class, first-class mail - mail that includes letters and postcards and packages sealed against inspection
   • black and white, written communication, written language - communication by means of written symbols (either printed or handwritten)
   subtypes: card - a rectangular piece of stiff paper used to send messages (may have printed greetings or pictures)
   has: letter, missive - a written message addressed to a person or organization
2. Compatibility of observations (synset 104720704)
   "there was no agreement between theory and measurement"; "the results of two tests were in correspondence"
   is a type of: compatibility - capability of existing or performing in harmonious or congenial combination
   subtypes: conformance, conformity - correspondence in form or appearance
   same as: agreement
3. The relation of corresponding in degree or size or amount (synset 113839491)
   is a type of: proportionality - a ratio of two quantities that is constant
   same as: commensurateness, proportionateness
4. (mathematics) an attribute of a shape or relation;
   Exact reflection of form on opposite sides of a dividing line or plane (synset 105071996)
   referred to in: math, mathematics, maths - a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement
   is a type of: spatial property, spatiality - any property relating to or occupying space
   subtypes:

   • geometrical regularity, regularity - a property of polygons: the property of having equal sides and equal angles
   • bilateral symmetry, bilateralism, bilaterality - the property of being symmetrical about a vertical plane
   • radial symmetry - the property of symmetry about an axis
   same as: balance, symmetricalness, symmetry
5. Similarity by virtue of corresponding (synset 104752480)
   is a type of: similarity - the quality of being similar
   same as: parallelism

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