1. (noun) (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

• ephemeris time
• tdt
• terrestrial dynamical time
• terrestrial time

2. (noun) a republic in the western central Pacific Ocean in association with the United States

• palau
• republic of palau

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

• federated states of micronesia
• micronesia

1. (noun) (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

• astronomy
• uranology

1. (noun) (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

• time unit
• unit of time