Gillion: /gil'y*n/ Or /jil'y*n/ [formed From {giga-} By Analogy With Mega/million And Tera/trillion] N.

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:gillion: /gil'y*n/ or /jil'y*n/ [formed from {giga-} by analogy
with mega/million and tera/trillion] n. 10^9. Same as an
American billion or a British `milliard'. How one pronounces
this depends on whether one speaks {giga-} with a hard or
soft `g'.
-- The AI Hackers Dictionary

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