Организация — организованные для выполнения общей цели люди, техника, ресурсы и знания. Предприятие (enterprise) может создавать внутри себя постоянные или временные организации для выполнения своих стратегических целей.

PMI Glossary:
An entity that may include all levels of the enterprise and may transcend business lines or divisions, including any area/business unit that has impact, influence, or involvement in project and business operations. The boundaries of an organization appropriate for OPM could vary by organization based on factors such as culture, size, maturity, and business needs. The principle is to include all aspects of project operations within an integrated framework.