1. billionth

adjective. ['ˈbɪljənθ'] the ordinal number of one billion in counting order.

Rhymes with Billionth

• millionth

Sentences with billionth

1. Noun, singular or mass
Using that definition, atoms have a radius of roughly one ten billionth of a meter.

2. one-billionth

noun. one part in a billion equal parts.

3. billionth

noun. ['ˈbɪljənθ'] position 1,000,000,000 in a countable series of things.

4. billionth

noun. ['ˈbɪljənθ'] one part in a billion equal parts.