Definitions for tt
Overview of noun tt
The noun tt has 3 senses? (no senses from tagged texts)
1. terrestrial time, TT, terrestrial dynamical time, TDT, ephemeris time
((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)
2. Palau, Republic of Palau, TT
(a republic in the western central Pacific Ocean in association with the United States)
3. Micronesia, Federated States of Micronesia, TT
(a country scattered over Micronesia with a constitutional government in free association with the United States; achieved independence in 1986)
