nonpareil

mastery
UK /nɒnpəˈɹeɪ(l)/ US /ˌnɑnpəˈɹɛl/nounadj

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What is the meaning of 'nonpareil' in this sentence?

The series stars Samantha Morton as Margaret Wells, a London brothel owner; Ms. Brown Findlay as Charlotte, her older daughter and the city’s courtesan nonpareil.