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quadrillion

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/kwɒˈdrɪljən/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/kwɑˈdrɪljən/ ,USA pronunciation: respelling(kwo dril′yən)

Inflections of 'quadrillion' (n):

quadrillions: npl (Used without a preceding number—e.g. "Lucy could see quadrillions of stars in the sky.")

quadrillion: npl (Used with a preceding number—e.g. "The cost is estimated at $4 quadrillion.")

quad•ril•lion /kwɑˈdrɪlyən/USA pronunciation n., pl. -lions, (as after a numeral) -lion, adj.
n. [countable]

the number written in the U.S. by 1 followed by 15 zeros, and in Great Britain by 1 followed by 24 zeros.

adj. [after a number and before a noun]

amounting to one quadrillion in number:two quadrillion stars.

quad•ril•lion (kwo dril′yən),USA pronunciation n., pl. -lions, (as after a numeral) -lion, adj.
n.

a cardinal number represented in the U.S. by 1 followed by 15 zeros, and in Great Britain by 1 followed by 24 zeros.

adj.

amounting to one quadrillion in number.

quadr- + -illion (as in million) 1665–75

quad•ril′lionth, n., adj.

Collins Concise English Dictionary © HarperCollins Publishers::

quadrillion /kwɒˈdrɪljən/ n

(in Britain) the number represented as one followed by 24 zeros (10²⁴)US and Canadian word: septillion
(in the US and Canada) the number represented as one followed by 15 zeros (10¹⁵)

determiner

amounting to this number: a quadrillion atoms

Etymology: 17th Century: from French quadrillon, from quadri- + -illion, on the model of millionquadˈrillionth adj

'quadrillion' also found in these entries (note: many are not synonyms or translations):

septillion - peta-

🗣️Forum discussions with the word(s) "quadrillion" in the title:

bigillion quadrillion
growth reaches 50 quadrillion units
nuclear <provided/produced> 3 quadrillion units of energy

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⇱ quadrillion - WordReference.com Dictionary of English

quadrillion