Roth IRA

Business / Accounting / Roth IRA: An IRA that allows for tax-free withdrawals as long as the contributions remain in the account for five years, and the account holder meets on e of the following criteria: age 59 1/2, death, disability or first-time home purchase.

Roth 401(K)

Business / Taxes / Roth 401(K): The Roth 401(k) retirement plan, which was introduced in 2006, allows you to make after-tax contributions to your account. Earnings may be withdrawn tax free, provided that you are at least 59 1/2 and MORE

Individual Retirement Account (IRA)

Business / Finance / Individual Retirement Account (IRA): For foreign exchange, the number of units of a foreign currency needed to buy one U.S. dollar. MORE

Individual Retirement Arrangement (IRA)

Business / Taxes / Individual Retirement Arrangement (IRA): An individual retirement arrangement (IRA), which may be set up as either an account or an annuity, allows people with earned income to contribute to a tax-deferred traditional IRA or a tax-free Roth MORE

Retroviral Infection

Science / Genetics / Retroviral Infection: The presence of retroviral vectors, such as some viruses, which use their recombinant dna to insert their genetic material into the chromosomes of the host's cells. The virus is then propogated by the MORE

Rete Mirabile

Science / Marine Biology / Rete Mirabile: A countercurrent exchange structure of capillaries that allows gas uptake in a fish swim bladder MORE

Respiratory System

Science / Biology / Respiratory System: One of eleven major body organ systems in animals; moves oxygen from the external environment into the internal environment and removes carbon dioxide from the body. MORE