What is Consent Rule?

Legal Definition
the name of a rule that is used when an ejectment suit, one that obtains possession of property, is used to remedy the determination of the title to the property.
Legal Definition
In the English practice, still adhered to in some of the states of the American Union, the defendant in ejectment is required to enter on record that he confesses the lease, entry, and ouster of the plaintiff; this is called the consent rule.

2. The consent rule contains the following particulars, namely: 1. The person appearing consents to be made defendant instead of the casual ejector; 2. To appear at the suit of the plaintiff; and, if the proceedings are by bill, to file common bail; 3. To receive a declaration in ejectment, and plead not guilty; 4. At the trial of the case to confess lease, entry, and ouster, and insist upon his title only; 5. That if at the trial, the party appearing shall not confess lease, entry, and ouster, whereby the plaintiff shall not be able to prosecute his suit, such party shall pay to the plaintiff the costs of the nonpros, and suffer judgment to be entered against the casual ejector; 6. That if a verdict shall be given for the defendant, or the plaintiff shall not prosecute his suit for any other cause than the non-confession of lease, entry, and ouster, the lessor of the plaintiff shall pay costs to the defendant; 7. When the landlord appears alone, that the plaintiff shall be at liberty to sign judgment immediately against the casual ejector, but that execution shall be stayed until the court shall further order. Adams, Ej. 233, 234 and for a form see Ad. Ej. Appx. No. 25. Vide 2 Cowen, 442; 4 John. R. 311; Caines' Cas. 102; 12 Wend. 105, 3 Cowen, 356; 6 Cowen, 587; 1 Cowen, 166; and Casual Ejector; Ejectment.
-- Bouviers Law Dictionary
Legal Definition
In English practice, A superseded instrument, in which a defendant in an action of ejectment specified for what purpose he intended to defend, and undertook to confess not only the fictitious lease, entry, and ouster, but that he was In possession. Consentientes et agentes pari poena plectentur. They who consent to an act, and they who do it, shall be visited with equal punishment. 5 Coke, 80. Consentire matrimonio non possnnt infra [ante] annos nubiles. Parties cannot consent to marriage within the years of marriage, [before the age of consent] 6 Coke, 22 Consequentiae non est consequentia. Bac. Max. The consequence of a consequence exists not
-- Black's Law Dictionary