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Billionth
01
one part in a billion equal parts
02
position 1,000,000,000 in a countable series of things
billionth
01
the ordinal number of one billion in counting order
billionth
n
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one part in a billion equal parts
position 1,000,000,000 in a countable series of things
the ordinal number of one billion in counting order
billionth