■ cardinal number ( plural ~s or (with numeral or quantifying word) same)
1》 a million million (1,000,000,000,000 or 10 12 ).
↘ Brit. dated a million million million (1,000,000,000,000,000,000 or 10 18 ).
2》 ( ~s ) informal a very large number or amount.
Derivatives
~th ordinal number .
Origin
C17: from Fr., from million , by substitution of the prefix tri- 'three' for the initial letters.