##### Wiktionary

**algebraic structure**

n. (context algebra English) One or more sets (carrier sets) together with a set of operations such that the sets are closure under the operations and are satisfying some axioms.

##### Wikipedia

**Algebraic structure**

In mathematics, and more specifically in abstract algebra, an **algebraic structure** is a set (called **carrier set** or **underlying set**) with one or more finitary operations defined on it that satisfies a list of axioms.

Examples of algebraic structures include groups, rings, fields, and lattices. More complex structures can be defined by introducing multiple operations, different underlying sets, or by altering the defining axioms. Examples of more complex algebraic structures include vector spaces, modules, and algebras.

The properties of specific algebraic structures are studied in abstract algebra. The general theory of algebraic structures has been formalized in universal algebra. Category theory is used to study the relationships between two or more classes of algebraic structures, often of different kinds. For example, Galois theory studies the connection between certain fields and groups, algebraic structures of two different kinds.