(US, modern British & Australian, short scale) A trillion trillion: 1 followed by 24 zeros, 10²⁴. / (dated British & Australian, long scale) A billion quintillion: 1 followed by 42 zeros, 10⁴².

plural of septillion

The ordinal form of the number septillion

The person or thing in the septillionth position. / One of a septillion equal parts of a whole.

(rare) By a multiple of one septillion; by a septillion times as much or as many.

(rare) By a factor of one septillion.

plural of septillionth