#annuity  income from capital investment paid in a series of regular payments; "his retirement fund was set up to be paid as an annuity"
  supertype:  #regular_payment__regularpayment  a payment made at regular times
  subtype:  #annuity_in_advance  an annuity paid in a series of more or less equal payments at the beginning of equally spaced periods; "rent payable in advance constitutes an annuity in advance for the landlord"
     subtype:  #rent  a regular payment by a tenant to a landlord for use of some property
        subtype:  #ground_rent__groundrent  payment for the right to occupy and improve a piece of land
        subtype:  #rack_rent  an extortionate rent
  subtype:  #ordinary_annuity  an annuity paid in a series of more or less equal payments at the end of equally spaced periods
  subtype:  #reversionary_annuity__survivorship_annuity  an annuity payable to one person in the event that someone else is unable to receive it
  subtype:  #tontine  an annuity scheme wherein participants share certain benefits and on the death of any participant his benefits are redistributed among the remaining participants; can run for a fixed period of time or until the death of all but one participant

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