billionth
UK ['bɪl.i.ənθ] US [-jənθ] ordinal number
■1 000 000 000 th written as a word 第十亿个•A nanometre is a billionth of a metre.一奈米是一米的十亿分之一。
UK ['bɪl.i.ənθ] US [-jənθ] noun countable
■one of a billion equal parts of something 十亿分之一•a billionth of a second十亿分之一秒 |