What is Correspondence?

Legal Definition
The letters written by one to another, and the answers thereto, make wbat is called the correspondence of the partie's.

2. In general, the correspondence of the parties contains the best evidence of the facts to which it relates. See Letter, contracts; Proposal.

3. When an offer to contract is made by letter, it must be accepted unconditionally for if the precise terms are changed, even in the slightest degree, there is no contract. 1 Bouv. Inst. n. 904. See, as to the power of revoking an offer made by letter, 1 Bouv. Inst. n. 933.
-- Bouviers Law Dictionary
Legal Definition
Interchange of written communications. The letters written by a person and the answers written by the one to whom they are addressed.
-- Black's Law Dictionary