>I disapprove of giving one instance as a "definition."

you must detest the Official Scrabble® Players Dictionary.

the thing to remember about these specialized glossaries* is that they're not intended to be used for looking up definitions, but merely to provide some validation, or maybe just context, for spellings. the OSPD includes this disclaimer:
It is important to remember that The Official Scrabble Players Dictionary was edited soley with this limited purpose [a guide to settle challenges] in mind. It is not intended to serve as a general dictionary of English; thus, such important features of general dictionaries as definitions of multipile senses, pronunciation respellings, etymologies, and usage labels are omitted.

*the specialized field in this case being spelling itself