"Tontine" is a word in LAW AND LEGAL, ENGLISH

In French law. A species Of association or partnership formed among persons who are in receipt Of perpettfai or life annuities, with the agreelnfent that the shares or annuities of those who die Bhall accrue to the survivors. This plan is Sald to be thus named frohi Touti, an Italian, who Invented it in the seventeenth' century. The principle is used in some forms of life insurance.. Merl. Repert

An annuity, with the benefit of survivorship, or a loan
raised on life annuities with the benefit of survivorship. Thus, an
annuity is shared among a number, on the principle that the share of
each, at his death, is enjoyed by the survivors, until at last the
whole goes to the last survivor, or to the last two or three, according
to the terms on which the money is advanced. Used also adjectively; as,
tontine insurance.