English

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English numbers (edit)
 ←  1,000,000 (106) [a], [b] ←  100,000,000 (108) 1,000,000,000 (109) 1012  → [a], [b] 1015  → [a], [b]
    Cardinal: billion, milliard, thousand million
    Ordinal: billionth, milliardth, thousand-millionth
    Multiplier: billionfold, milliardfold, thousand-millionfold
    Metric collective prefix: giga-
    Metric fractional prefix: nano-
    Number of years: giga-annum, gigayear

Etymology

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From milliard +‎ -th.

Adjective

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milliardth (not comparable)

  1. (now rare) The ordinal form of the number one milliard.

Noun

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milliardth (plural milliardths)

  1. (now rare) The person or thing in the milliardth position.
  2. (now rare) One of a milliard equal parts of a whole.