Okla. Stat. tit. 25 § 27 : — Definitions and General ProvisionsMeanings of Words and Construction of Statutes — Compound Interest Defined TEXT PDF The words "compound interest" mean interest added to the principal as the former becomes due, and thereafter made to bear interest. Okla. Stat. tit. 25, § 27 R.L. 1910, § 2946.