Daily entries from the 17th century London diary
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From the OED:
An eating-house or tavern where public meals are provided at a fixed price; a dining room in such a building.
In the 17th century, the more expensive ordinaries were frequented by men of fashion, and the dinner was usually followed by gambling; hence the term was often used as synonymous with
An Ordinary was also a meal, usually a lunchtime meal, that was available in pubs. This is the sense that it has when Pepys says, “I went to an Ordinary at the King