a meeting, especially a secret one, often for sexual or romantic reasons 幽会;约会 rumours about his secret assignations with his friend’s wife 关于他和朋友妻子秘密约会的谣言
Word Originlate Middle English (in the senses ‘command, appointment to office, or allotment of revenue’): via Old French from Latin assignatio(n-), from the verb assignare, from ad- ‘to’ + signare ‘to sign’.