billionth

Noun billionth has 2 senses

• billionth(n = noun.linkdef) - position 1,000,000,000 in a countable series of things;
is a kind of rank

• billionth(n = noun.quantity) one-billionth - one part in a billion equal parts;
is a kind of common fraction, simple fraction

Adjective billionth has 1 sense

• billionth(s = adj.all) - the ordinal number of one billion in counting order;