One of the mysteries of the English language finally explained.
Without division into specified shares; in common (applied to a right, property, etc., held jointly by two or more persons).
Of a right, property, etc.: held or owned jointly by two or more individuals. Of a person, group, etc.: holding a right, property, etc., in this way.
Early 17th century; earliest use found in John Cowell (1554–1611), civil lawyer. From Law French pro indiuiso and its etymon classical Latin prō indīvīsō jointly, in common (usually with reference to ownership) from prō + indīvīsō, ablative of indīvīsum, neuter of indīvīsus.
pro indiviso/ˌprəʊ ɪndɪˈviːzəʊ/
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