One of the mysteries of the English language finally explained.
1Constituting number one billion in a sequence; 1,000,000,000th.‘the birth of India's billionth citizen’
- 1.1informal Constituting an unspecified but very large number in a sequence.‘I was late again for the billionth time’
- 1.1informal Constituting an unspecified but very large number in a sequence.
2Each of one billion equal parts into which something is or may be divided.‘particles so small they're measured in billionths of a metre’
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