He talked of miseries which his wife had brought upon him; of the rebellious disposition, vice, malice, and premature bad passions of you his only son, who had been trained to hate him; and left you, and your mother, each an annuity of eight hundred pounds.
There are no more uses of "annuity" in the book.
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The annuity does not increase with inflation.
The annuity is fixed and insured, but if the economy gets bad enough, the annuity can decrease.