An arrangement of the members of a set in order, as though each member had assigned to it one of a series of consecutive integers.
Early 20th century; earliest use found in American Journal of Psychology. From rank + order.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。