countable an arrangement to see someone at a particular time, especially for a business meeting or to get a professional servicemake an appointment: Why don’t you make an appointment with one of our doctors?
appointment with: I’d like to arrange an appointment with the headteacher.
appointment to do something: I have an appointment to see my lawyer next Saturday.
keep an appointment (=go to an appointment that you have arranged): Please notify us if you are unable to keep your appointment.
by appointment: Viewing of the property is by appointment only.