›the state or fact of owning something: under sb's ownershipThe business has been under the same ownership for 44 years.home/property ownershipThe spiralling cost of housing has pushed home ownership beyond the reach of many people.share/stock ownershipThe organization promotes wider share ownership.take/acquire/retain ownership of sthEarlier this year the group took 51% ownership of the financial services unit.State-owned railways were taken into private ownership.
›the fact of taking responsibility for an idea or problem: We need someone to take ownership of the issue.