- 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
--1 is a kind of time unit, unit of time
- Palau, Republic of Palau, TT - a republic in the western central Pacific Ocean in association with the United States
--2 is a kind of country, state, land
--2 is a part of Palau, Palau Islands, Belau, Pelew - 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
--3 is a kind of country, state, land
--3 is a part of Micronesia
--3 has parts: