1. (noun) 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
Synonyms: ephemeris time, terrestrial time, terrestrial dynamical time
2. (noun) Palau, Republic of Palau, TT
a republic in the western central Pacific Ocean in association with the United States
Synonyms: ephemeris time, terrestrial time, terrestrial dynamical time
3. (noun) 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
Synonyms: ephemeris time, terrestrial time, terrestrial dynamical time
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Synonyms for tt 
