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ap‧point‧ment S1 W2

1 [countable] an arrangement for a meeting at an agreed time and place, for a particular purpose COLLOCATIONS 
have an appointment make an appointment an appointment to do something book an appointment British English schedule an appointment American English (=make an appointment) cancel an appointment miss an appointment keep an appointment (=go to an appointment you have arranged) doctor's/dentist's/dental appointment by appointment (only) (=only if you make an appointment in advance)

have an appointment make an appointment an appointment to do something book an appointment British English schedule an appointment American English (=make an appointment) cancel an appointment miss an appointment keep an appointment (=go to an appointment you have arranged) doctor's/dentist's/dental appointment by appointment (only) (=only if you make an appointment in advance)
2 [uncountable and countable] when someone is chosen for a position or job
3 [countable] a job or position, usually involving some responsibility
appointment as
He has taken up an appointment as Professor of Chemistry.
He has taken up an appointment as Professor of Chemistry.4 a phrase that can be used by a business that sells goods or services to the Queen
