Demi
Defined in 3 dictionaries — Ballentine's (1916), Black's (1910), Kinney (1893)
Ballentine's Law Dictionary
James A. Ballentine · 1916
Half.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
French. Half; the half. Used chiefly in composition. As to deml "Mark," "Official," "Vill," see those titles.
A Law Dictionary and Glossary
George C. Kinney · 1893
demy, fr. Half. V. Half-blood. In old English law. of money of the value of which was necessai-y