tt   (TTS Sound)

The noun tt has 3 senses

• terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time -- ((astronomy) a measure of time defined by Earth's orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth's motions)


• Palau, Republic of Palau, TT -- (a republic in the western central Pacific Ocean in association with the United States)


• Micronesia, Federated States of Micronesia, TT -- (a country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986)