numeric
one trillion; 1,000,000,000,000
The number 10^12 in the short scale (one trillion). In Japanese, large numbers are grouped by four digits (万, 億, 兆), so 一兆 is 1,0000,0000,0000.
一兆円は大きな額です。
One trillion yen is a large amount of money.
一兆は千億の十倍です。
One trillion is ten times one hundred billion.
億 is 10^8 (one hundred million), while 兆 is 10^12 (one trillion).
万 is 10^4 (ten thousand), a much smaller unit than 兆.
一 (one) + 兆 (trillion, a unit of 10^12). The reading いっちょう is a regular combination of いち and ちょう with gemination.