bignum

noun — 2 senses

bignum

noun

UK /ˈbɪɡnʌm/

Etymology Short for big number.

Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences A number whose digits of precision are limited only by available memory (as opposed to the usual fixed-point arithmetic).

Computing, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences Broadly, Slang A very large number.

Then there's the membership fee. A serious bignum.2017, Dean Koontz, The Silent Corner, page 198:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.