Semi-matrimonium
Defined in 3 dictionaries — Ballentine's (1916), Black's (1910), Kinney (1893)
Ballentine's Law Dictionary
James A. Ballentine · 1916
(Civil Law) Concubinage.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Lat.
In Roman law. Half-marriage. Concubinage was so called. Tayl. Civll Law, 273.
A Law Dictionary and Glossary
George C. Kinney · 1893
I.
In the Roman law. Half-marriage. Concubinage was so called.