Definition of 'tt'

Noun

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

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