Power, authority; = "potency".
Late 16th century; earliest use found in Nicol Burne (fl. 1574–1598), Roman Catholic controversialist. From potent + -ness.
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。