inter-bank market 'offered' rate (IBOR) - the rate of interest at which funds are offered on loan for a specified period in the inter-bank market to first class banks. Offers are subject to availability within dealing limits, and may be limited in amount. The London inter-bank offered rate (LIBOR) is a possible alternative to a bank's base rate from which the bank relates its interest charges on lending., inter-bank rates - rates of interest charged on inter-bank loans