1. terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time, time unit, unit of time

usage: (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

2. Palau, Republic of Palau, TT

usage: a republic in the western central Pacific Ocean in association with the United States

3. Micronesia, Federated States of Micronesia, TT

usage: a country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986

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See also: tt (Dictionary)