1. an annuity paid in a series of more or less equal payments at the beginning of equally spaced periods; - Example: "rent payable in advance constitutes an annuity in advance for the landlord"
WordNet (r) 3.0 (2006):
annuity in advance
n 1: 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"