MUSCLES OF RESPIRATION. When the diaphragm contracts in inspiration, initially the lower ribs are fixed and the dome of the diaphragm descends, thus increasing the vertical diameter of thorax.
arrearage. 1  the state or condition of being in arrears. 2  Often, arrearages. arrears; amount or amounts overdue. 3  Archaic. a thing or part kept in reserve.
Arbitrage Bond. DEFINITION of 'Arbitrage Bond'. A debt security with a lower interest rate issued by a municipality prior to the call date of the municipality's existing higher-rate security. Proceeds from the issuance of the lower-rate bonds are invested in treasuries until the call date of the higher-interest bonds.