Pronunciation: (ton'tēn, ton-tēn'),[key] —n. 1. an annuity scheme in which subscribers share a common fund with the benefit of survivorship, the survivors' shares being increased as the subscribers die, until the whole goes to the last survivor.
2. the annuity shared.
3. the share of each subscriber.
4. the number of subscribers.
5. any of various forms of life insurance in which the chief beneficiaries are those whose policies are in force at the end of a specified period (ton'tine pe"riod) .