Corres

Corres is an informal abbreviation that can refer to correspondence, the act of communicating by exchanging letters, emails, or messages. The term is also used as shorthand for the broader concept of correspondences—relations between two or more entities that pair elements from one set with elements from another. The exact meaning depends on context.

In everyday use, correspondence covers letters and emails between individuals, organizations, or departments, including business correspondence such as inquiries, orders, and replies. Digital correspondence has largely supplanted paper letters but preserves formal conventions in tone and structure.

In mathematics, a correspondence is a relation that associates each element of one set with one or more elements of another set. A function is a special kind of correspondence that assigns exactly one element of the second set to each element of the first. The term appears in discussions of bijections, equivalence relations, and mappings.

In linguistics, sound and lexical correspondences describe systematic similarities between languages, often used in historical reconstruction to trace language families. In computer science and data theory, correspondences refer to mappings that align elements across schemas or datasets.

The word stems from the Latin correspondere and entered English via French. As a shorthand, corres is mainly encountered in informal writing or notes, while formal uses prefer correspondence or correspondence relations.