A business interaction is defined as a unit of behaviour performed as a collaboration between two or more business roles.

A business interaction is similar to a business process/function, but while a process/function may be performed by a single role, an interaction is performed by multiple roles in collaboration.

A business interaction may be triggered by, or trigger, any other business behaviour element (business event, business process, business function, or business interaction).

A business interaction may access business objects.

A business interaction may realize one or more business services and may use (internal) business services or application services.

A business collaboration or an application collaboration may be assigned to a business interaction.

The name of a business interaction should preferably be a verb in the simple present tense.

Category: Business Layer and Behaviour aspect

Examples: Formalise Request, Check and Sign Contract, Take out Combined Insurance.

Typical Relationships:

Assignment - business collaboration, application collaboration
Access - business object
Triggering - business event, business process, business function, business interaction
Realisation - business service

Source: Archi - The Free ArchiMate Modelling Tool - Hint for the model element.