0 It means the Doctor can find time to see him -- usually implying the the time is not really available on the schedule. Suppose the doctor already has an appointment scheduled for every half-hour during the day, but he knows that the appointment scheduled for 2:30 won't take the whole 30 minutes, so he can "fit in" another patient before the 3:00 appointment. Or the Doctor might delay his lunch hour so he can "fit in" an extra patient during his normal lunch break.
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