Timeshare is described as:

Timeshare refers to a type of ownership in which multiple individuals hold rights to use a property, typically a vacation home or resort, during designated time periods. Each owner has a specific time allotted for their use of the property, meaning that ownership is structured to allow for different owners to occupy the property at different times throughout the year. This model provides flexibility and helps make vacation properties more affordable by sharing the costs among multiple owners while still allowing each owner dedicated time for their enjoyment.

In contrast to different ownership models like co-ownership where ownership rights might be more equal and simultaneous, the timeshare concept distinctly revolves around these set periods for different owners, allowing more individuals access to typically high-demand vacation properties. The other options describe different arrangements, but they do not capture the essential definition of timeshare ownership, which specifically focuses on the timing of usage rights among multiple owners.