invitation
noun [ C or U ]
uk/ˌɪnvɪˈteɪʃən/ usif someone receives an invitation, they are asked to go somewhere or do something:
an invitation to sth I received an invitation to dinner at a colleague's house.
an invitation to do sth He accepted the invitation to attend the seminar.
decline/turn down/reject an invitation
a formal request to do something, for example, have an interview for a job:
an invitation to do sth He rarely turns down an invitation to speak at a conference.
extend/issue an invitation The invitation was extended to other candidates.