De Æquitate
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
In equity. De jure stricto, nihil possum vendicare, de œquitate tamen, nullo modo hoc obtinet; In strict law, I can claim nothing, but in equity this by no means obtains.
Fleta, 11b. 3, c. 2, § 10.