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Noun representing the number 100,000,000. Used as a counter for large quantities, often in financial or statistical contexts. Requires pairing with other numbers (e.g., 『一億』 ichioku, 'one hundred million'). Example: 『人口は一億人です』 (jinkou wa ichioku nin desu, 'The population is one hundred million people').
Theme

Two friends, Ken and User, are discussing the population of Tokyo while walking through the city.

おく

hundred million (numerical unit)

Numbers & CountingNumbers (1–兆)

Memory Hook

Think of a huge 'okay' (sounds like 億 oku) — a hundred million is so big, it's okay to be amazed! 'Okay, that's a hundred million!' → 『億』 (oku).

Cultural Note

『億』 (oku, 'hundred million') is a common unit in Japanese for large numbers, often used in finance, population statistics, and media to describe sums like national budgets or lottery winnings.

Forms

Base: 億Noun representing the number 100,000,000. Used as a counter for large quantities, often in financial or statistical contexts. Requires pairing with other numbers (e.g., 『一億』 ichioku, 'one hundred million'). Example: 『人口は一億人です』 (jinkou wa ichioku nin desu, 'The population is one hundred million people').