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Adverb: id est  id'est
  1. That is to say; in other words (used to introduce a clarification or more precise description)
    "Rant, rave and get it off my chest (id est, post randomly)";
    - i.e., ie
Noun: EST
  1. Standard time in the 5th time zone west of Greenwich, reckoned at the 75th meridian; used in the eastern United States
    - Eastern Time, Eastern Standard Time, ET

See also: so yeah [informal]

Type of: civil time, local time, standard time

Encyclopedia: Id est

EST