noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A former standard astronomical time scale intended to overcome the drawbacks of irregularly fluctuating mean solar time, superseded in the 1970s. uncountable
2. 2
   (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 wordnet
3. 3
   A modern relativistic-coordinate time scale. uncountable

Synonyms

All synonyms

tdtterrestrial dynamical timeterrestrial timett