FIDELITY ADVISOR FREEDOM 2045 FUND CLASS MUTUAL FUNDS USMF - What does FIDELITY ADVISOR FREEDOM 2045 FUND CLASS MUTUAL FUNDS USMF mean? - What does FIDELITY ADVISOR FREEDOM 2045 FUND CLASS MUTUAL FUNDS USMF stand for? - FIDELITY ADVISOR FREEDOM 2045 FUND CLASS MUTUAL FUNDS USMF meaning