Section 408.231 - Definitions1. A "second mortgage loan" shall mean a loan secured in whole or in part by a lien upon any interest in residential real estate created by a security instrument, including a mortgage, trust deed, or other similar instrument or document, which provides for interest to be calculated at the rate allowed by the provisions of section 408.232, which residential real estate is subject to one or more prior mortgage loans.2."Principal" of a second mortgage loan means the total of the net amount paid to, receivable by, contracted for, or paid or payable for the account of the borrower, and to the extent payment is deferred, additional charges permitted by section 408.233.3."Residential real estate" shall mean any real estate used or intended to be used as a residence by not more than four families, notwithstanding the provisions of section 408.015.L. 1979 S.B. 305, A.L. 1980 H.B. 1195, A.L. 1981 S.B. 5 Revision, A.L. 1985 S.B. 183, A.L. 1986 S.B. 667, A.L. 1994 H.B. 1312 merged with S.B. 718