tt meaning and definition

TT noun

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: ephemeris time, TDT, terrestrial dynamical time, terrestrial 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: Federated States of Micronesia, Micronesia