tt Meaning, Definition & Usage

1. noun (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
   terrestrial dynamical time; terrestrial time; ephemeris time; TDT.
   
2. noun a republic in the western central Pacific Ocean in association with the United States
   Republic of Palau; Palau.
   
3. noun a country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986
   Federated States of Micronesia; Micronesia.
   

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