An ecclesiastical pension is an allowance from the revenues of a benefice granted by competent authority either to its former holder or any other, generally for some service rendered to the benefice itself or to the beneficiary.
A pension is personal, if paid by the beneficiary, or real, if levied on the benefice itself.
A local Ordinary when conferring a benefice may for a just reason subject the benefice to a temporary pension lasting during the lifetime of the beneficiary, who must, however, be left a suitable income.
On parochial benefices an Ordinary can impose pensions only in favor of the pastor or his vicar when he retires from office.
Such a pension is not to exceed a third part of the entire parish revenues which remain after all the expenses and uncertain revenues have been deducted.
Pensions imposed upon any benefices either by the Holy See or local Ordinary cease with the death of the pensioner.
New Catholic Dictionary