Wiki: "An organization is an entity comprising multiple people, such as an institution or an association, that has a collective goal and is linked to an external environment."
Synthetic definition by Thetta: "An organization is an entity that is comprised of multiple actors (humans, smart contracts, etc) with clear governance rules, incentives and internal capital.
Example: "TheDAO" as an organization (in this sense) consists of:
Actors - token holders and curators
Clear governance rules and incentives - deployed code
Internal capital - tokens, ETH (profit and funds)
What is not included:
Domain and web site - DaoHub.org (asset, but not an internal capital)
Legal entity - DAO.Link company (asset, but not an internal capital)
(TODO) We are not sure if these entities should be included or not: