The designation by which an action is known in the law. Under the old rigid and inflexible pleading requirements of the common law each particular writ had specific and invariable forms of process, pleading, trial and judgment. The common-law forms of action were account, covenant, debt, detinue, ejectment, general assumpsit. replevin, special assumpsit, trespass on the case, trespass, and trover. These have been abolished and replaced by the modern civil procedure rules of pleading and actions.