WordNet sense 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):

TDT, terrestrial time, ephemeris time, terrestrial dynamical time

WordNet sense 2 (a republic in the western central Pacific Ocean in association with the United States):

Palau, Republic of Palau

WordNet sense 3 (a country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986):

Micronesia, Federated States of Micronesia