gillion
<unit> /gil'y*n/ or /jil'y*n/ (From giga- by analogy with mega/million and tera/trillion) 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".
Nearby terms:
GigaHertz « GIGO « gilley « gillion » Gilmore, John » GIM-1 » GIN