'TT' definitions:

(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 [syn: terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time]

A republic in the western central Pacific Ocean in association with the United States [syn: Palau, Republic of Palau, TT]

A country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986 [syn: Micronesia, Federated States of Micronesia, TT]