An operating segment is a component of an entity:
(a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same entity),
(b) whose operating results are regularly reviewed by the entity’s chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and
(c) for which discrete financial information is available.
Operating segment is specifically discussed in IFRS 8 Operating Segments.
Source: Glossary of Terms of IFRSs as at 31 December 2008.
