邀约 is a formal or literary noun meaning 'invitation' or 'appointment', often implying a planned, mutual agreement to meet or do something. The first character 邀 (yāo) means 'to invite' — it carries the sense of actively requesting someone’s presence or participation. The second character 约 (yuē) means 'to make an appointment' or 'to agree upon'; it emphasizes the mutual commitment and scheduled nature of the arrangement. Together, 邀约 conveys not just the act of inviting, but the resulting agreed-upon meeting or engagement — it’s more refined and less casual than common alternatives like 邀请 or 约会.

This term appears frequently in written Chinese — such as formal letters, event announcements, business correspondence, or literary descriptions — but is rarely used in everyday spoken conversation. It often suggests politeness, intentionality, and formality; for example, a company might issue an 'invitation to tender' using 邀约, or a novel might describe 'a quiet invitation to tea' with this word. Its tone is courteous and slightly elevated, making it unsuitable for informal chats among friends.