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| Subject | Russian | English |
| gen. | миллиард лет | billion years |
| nat.sc. | миллиард лет | Gyr (A billion years or giga-annum (109 years) is a unit of time on the petasecond scale, more precisely equal to 3.16×1016 seconds (or simply 1,000,000,000 years). The terms are used in geology, paleontology, geophysics, astronomy, and physical cosmology. Byr was formerly used in English-language geology and astronomy as a unit of one billion years. Subsequently, the term gigaannum (Ga) has increased in usage, with Gy or Gyr still sometimes used in English-language works (at the risk of confusion with Gy as abbreviation for the gray, a unit of radiation exposure). Astronomers use Gyr or Gy (or Ga, where the a stands for annum, Latin for "year") as the symbol for gigayear.  wikipedia.org LyuFi) |
| geochron. | миллиард лет | Ga (MichaelBurov) |
| gen. | миллиард лет | eon (единица геологического времени) |
| geochron. | миллиард лет | giga annum (pl.: giga annums MichaelBurov) |
| geochron. | миллиард лет | gigayear (MichaelBurov) |
| geochron. | миллиард лет | Gy (MichaelBurov) |
| geochron. | миллиард лет | Gyr (MichaelBurov) |
| geochron. | миллиард лет | one-billion years (MichaelBurov) |
| geochron. | миллиард лет | gigaannum (pl.: gigaannums MichaelBurov) |
| gen. | миллиард лет | aeon (единица геологического времени) |
| oil | миллиард лет до настоящего времени | billion years before present |
| geochron. | миллиардов лет | Gy (MichaelBurov) |
| geochron. | миллиардов лет | Gyr (MichaelBurov) |
| geochron. | миллиардов лет | Ga (MichaelBurov) |
| oil | миллиардов лет | billion years |
| astr. | Миллиардов лет тому назад | Giga Years Ago (Yakov) |