Equity, n.; pl. Equities.
Etymology: [F. équité, L. aequitas, fr. aequus even, equal. See Equal.]
1. Equality of rights; natural justice or right; the giving, or desiring to give, to each man his due, according to reason, and the law of God to man; fairness in determination of conflicting claims; impartiality. Christianity secures both the private interests of men and the public peace, enforcing all justice and equity. Tillotson.
2. (Law)
An equitable claim; an equity of redemption; as, an equity to a settlement, or wife's equity, etc. I consider the wife's equity to be too well settled to be shaken. Kent.
3. (Law)
3 more senses
A system of jurisprudence, supplemental to law, properly so called, and complemental of it. Equity had been gradually shaping itself into a refined science which no human faculties could master without long and intense application. Macaulay.
Note: Equitable jurisprudence in England and in the United States grew up from the inadequacy of common-law forms to secure justice in all cases; and this led to distinct courts by which equity was applied in the way of injunctions, bills of discovery, bills for specified performance, and other processes by which the merits of a case could be reached more summarily or more effectively than by common-law suits. By the recent English Judicature Act (1873), however, the English judges are bound to give effect, in common-law suits, to all equitable rights and remedies; and when the rules of equity and of common law, in any particular case, conflict, the rules of equity are to prevail. In many jurisdictions in the United States, equity and common law are thus blended; in others distinct equity tribunals are still maintained. See Chancery. Equity of redemption (Law), the advantage, allowed to a mortgageor, of a certain or reasonable time to redeem lands mortgaged, after they have been forfeited at law by the nonpayment of the sum of money due on the mortgage at the appointed time. Blackstone.
Syn. -- Right; justice; impartiality; rectitude; fairness; honesty; uprightness. See Justice.
Shades of meaning
Fernald has no entry of its own for equity; he lists it under justice.
Where he writes about it:
In its governmental relations, human or divine, justice is the giving to every person exactly what he deserves, not necessarily involving any consideration of what any other may deserve; equity (the quality of being equal) is giving every one as much advantage, privilege, or consideration as is given to any other; it is that which is equally right or just to all concerned; equity is equal justice and is thus a close synonym for fairness and impartiality, but it has a philosophical and legal precision that those words have not. — from justice
The system of equity, devised to supply the insufficiencies of law, deals with cases "to which the law by reason of its universality can not apply." "Equity, then, ... is the soul and spirit of all law; positive law is construed and rational law is made by it." BLACKSTONE bk. iii, ch. 27, p. 429. — from justice