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ENGLISH DICTIONARY

Num
Pronunciation: /ˈbɪljən/
Pronunciation (ENPR): bĭl'yən

Definition 1:
• Either of two large amounts:
• a thousand million (logic: 1,000 × 1,000²): 1 followed by nine zeros, 10⁹.
Wiktionary-listed synonyms: milliard, thousand million
Labels: US

Definition 2:
• Either of two large amounts:
• A million million (logic: 1,000,000²): a 1 followed by twelve zeros (10¹²); a thousand milliard.
Wiktionary-listed synonyms: trillion[short scale]]>
Labels: dated

Definition 3:
• An unspecified very large number.
Example: There were billions of people at the concert.
Wiktionary-listed synonyms: gazillion
Labels: colloquial, excessive

Source and attribution
Wiktionary contributors, via Kaikki/Wiktextract. Derived from Wiktionary; CC BY-SA and GFDL terms apply. Source: https://en.wiktionary.org/wiki/billion