BILLIONTH

billionth

(adjective) the ordinal number of one billion in counting order

billionth, one-billionth

(noun) one part in a billion equal parts

billionth

(noun) position 1,000,000,000 in a countable series of things

Source: WordNet® 3.1

Etymology

Adjective

billionth (not comparable)

The ordinal form of the number one billion.

Noun

billionth (plural billionths)

The person or thing in the billionth position.

One of a billion equal parts of a whole.

Source: Wiktionary

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