billionth

Words with a similar base: billionth, one-billionth

'billionth'

[billionth.n.01] as in: position 1,000,000,000 in a countable series of things

'billionth'

[one-billionth.n.01] as in: one part in a billion equal parts

'billionth'

[billionth.s.01] as in: the ordinal number of one billion in counting order