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1. The cardinal number equal to 1048.
2. Chiefly British The cardinal number equal to 1090.
[Latin quīndecim, fifteen (quīnque, five; see penkwe in Indo-European roots + decem, ten; see deci-) + (m)illion.]
quin′de·cil′lionth adj.adv. & n.
(in long scale) the number represented as one followed by 90 zeros (1090)(in short scale) the number represented as one followed by 48 zeros (1048)
quin•de•cil•lion(ˌkwɪn dɪˈsɪl yən)
n., pl. -lions, (as after a numeral) -lion, n.
1. a cardinal number represented in the U.S. by 1 followed by 48 zeros, and in Great Britain by 1 followed by 90 zeros.adj.
2. amounting to one quindecillion.
[1900–05; < Latin quīndec(im) fifteen + -illion (as in million)]
quin`de•cil′lionth, adj., n.