English

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English numbers (edit)
 ←  1,000 1,000,000 (106) 1,000,000,000 (109)  → [a], [b], [c]
    Cardinal: million
    Ordinal: millionth
    Multiplier: millionfold
    Metric collective prefix: mega-
    Metric fractional prefix: micro-
    Number of years: millionennium, megannum, megayear

Etymology

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From million +‎ -fold.

Adjective

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millionfold (not comparable)

  1. A million times so
    a millionfold dilution
    a millionfold increase

Translations

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Adverb

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millionfold (not comparable)

  1. By a factor of a million.