billionth /'biljәnθ/ 📖 中文释义 num. 第十亿个, 十亿分之一 🧩 词形变化 复数 billionths 📘 English Definition(英文释义) n. position 1,000,000,000 in a countable series of thingss. the ordinal number of one billion in counting order ← billions upon billions of B 字母词表 billionths →