English numbers (edit)
 ←  1,000  ←  1,000,000 (106) 1,000,000,000 (109)
    Cardinal: billion, milliard
    Ordinal: billionth, milliardth

Pronunciation

change

Adjective

change

Positive
billionth

Comparative
none

Superlative
none

  1. (ordinal number) The billionth thing is something that is number one billion (US: 1,000,000,000; UK 1,000,000,000,000) in order.

Singular
billionth

Plural
billionths

  1. (countable) A billionth of something is one of billion equal parts of that thing.