A master craftsman or master tradesman (sometimes called only master or grandmaster) was a member of a guild. In the European guild system, only masters and journeymen were allowed to be members of the guild.\n\nAnswer this question based on the passage: what is the definition of a master craftsman?
Step-by-step reasoning:
a member of a guild
The relevant information is: A master craftsman or master tradesman (sometimes called only master or grandmaster) was a member of a guild.

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Final answer: a member of a guild