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entity go
that which is perceived or known or inferred to have its own distinct existence (living or nonliving)

abstraction, abstract entity go
a general concept formed by extracting common features from specific examples

relation go
an abstraction belonging to or characteristic of two entities or parts together

mathematical relation
a relation between mathematical expressions (such as equality or inequality)

noun.relation

4 Subcategories

function, mapping, map, mathematical function, single-valued function go
(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)
parity go
(mathematics) a relation between a pair of integers: if both integers are odd or both are even they have the same parity
transitivity go
(logic and mathematics) a relation between three elements such that if it holds between the first and second and it also holds between the second and third it must necessarily hold between the first and third
reflexivity, reflexiveness go
(logic and mathematics) a relation such that it holds between an element and itself