Concurrent liability: where a defendant's liability to a plaintiff can be placed, at least potentially, on more than one of the bases of tort, breach of contract, breach of an equitable obligation or breach of a statutory obligation.

Concurrent wrongdoer: one of two or more wrongdoers (joint wrongdoers and/or several wrongdoers) whose acts concur to produce a single damage to a plaintiff under the same head of liability.

D1: generally the defendant claiming contribution (from D2).

D2: generally the person from whom contribution is sought (by D1).

Joint and several liability: a synonym for “solidary liability”.

Joint wrongdoers: one of two or more wrongdoers who produce, by what is taken by law to be the same act, a single damage to a plaintiff.

Mixed concurrent wrongdoer: one of two or more wrongdoers (joint wrongdoers and/or several wrongdoers) whose acts concur to produce a single damage to a plaintiff under more than one head of liability and may include breach of separate contracts.

P: the plaintiff.

Several wrongdoers: one of two or more wrongdoers who produce, by independent acts, a single damage to a plaintiff.

Solidary liability: describes a situation where, of two or more concurrent wrongdoers, each is liable severally and all are liable jointly to an injured person and that injured person may choose to sue each wrongdoer separately or any number jointly and also may choose to recover full compensation from any one of the wrongdoers against whom judgment is entered.

Tort: a civil wrong usually resulting in a defendant's liability in damages.

Tortfeasor: a wrongdoer whose liability is grounded in tort; the perpetrator of a tort.

Wrong: a crime, tort, breach of contract, breach of trust or other equitable obligation, or breach of statutory obligation.

Wrongdoer: a person who commits a wrong.