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The Collaborative International Dictionary
Coparcener

Coparcener \Co*par"ce*ner\ (-n[~e]r), n. [Pref. co- + parcener.] (Law) One who has an equal portion with others of an inheritance.

All the coparceners together make but one heir, and have but one estate among them.
--Blackstone.

Wiktionary
coparcener

n. Any of several people who share an inheritance; a parcener.