Plural form of copyhold; multiple instances of land held under the copyhold system, or tenants who hold such land.
Copyhold from copy (a transcribed document) and hold (to possess); the plural simply adds -s to refer to multiple copyholds or copyholders.
By the 1600s, copyholds had become so secure that many copyholders were essentially as safe in their tenure as freeholders, even though technically the lord still owned the land—it's a fascinating example of how written records and legal custom can gradually transform property rights.
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