1. a written or spoken request asking someone to go somewhere or to do something
2. the act of inviting someone
3. something that encourages a particular action or response

Examples

• She received an invitation to the wedding.
• The party invitation arrived in the mail yesterday.
• He declined their invitation to dinner.
• The invitation was extended to all employees.
• The open door was an invitation to burglars.
• Her smile was an invitation to conversation.
• The invitation requested a formal response by Friday.