Having a mission; sent on a mission or errand.
Late 18th century; earliest use found in Robert Southey (1774–1843), poet and reviewer. Either from mission + -ed, or from mission + -ed.
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。