The 1991 ISDA Definitions are intended for use with the 1987 ISDA Interest Rate and Currency Exchange Agreement and 1992 ISDA Master Agreement (Multi-currency, Cross-Border). The Definitions provide a set of standard terms, including floating rate options, and the basis for calculating fixed and floating amounts, for incorporation in each transaction confirmation under the multi-currency documents. The 1991 Definitions are an expansion of the 1987 Interest Rate and Currency Exchange Definitions and include new definitions, additional currencies, certain provisions from the 1989 and 1990 Addenda, and exhibits depicting forms of telex or letter agreement that may be used as a confirmation for an individual transaction.