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WordNet (r) 3.0 (2006) (WordNet)

TT
n 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 [synonym:
{terrestrial time}, {TT}, {terrestrial dynamical time},
{TDT}, {ephemeris time}]
2: a republic in the western central Pacific Ocean in
association with the United States [synonym: {Palau}, {Republic
of Palau}, {TT}]
3: a country scattered over Micronesia with a constitutional
government in free association with the United States;
achieved independence in 1986 [synonym: {Micronesia}, {Federated
States of Micronesia}, {TT}]