Ratio decidendi

Definition

The legal reasoning on which a court's decision actually rests, and which therefore binds future courts. It is the part of the opinion that matters, buried beneath the rest of the prose.

Example Usage

Law students spent the week extracting the ratio decidendi from a 90-page opinion.

Origin

Latin, 'the reason for deciding'.

Source: Common law doctrine; Black's Law Dictionary

Related Terms

Beginner

term

Legal speak for 'the rules of the game that you're legally bound to follow whether you understand them or not.' In contracts, terms are the specific conditions, timelines, and obligations that make lawyers rich and everyone else confused.

⚖️ Legal

Intermediate

remanded

When a higher court tells a lower court 'nice try, but do it again' and sends a case back for round two, or when a judge sends a defendant back to their temporary home in a cell while awaiting trial. It's the legal equivalent of 'return to sender' or 'see me after class.' Either way, someone's going back to square one with extra homework.

⚖️ Legal

Beginner

defective

Having one or more flaws that prevent proper functioning, like your supposedly waterproof phone or that new hire who can't figure out the copier. In product liability law, this term launches a thousand lawsuits. In grammar, it describes verbs so irregular they're missing entire conjugations, like 'must' having no past tense—ironically defective themselves.

⚖️ Legal

Beginner

informer

A person who snitches to authorities, or more charitably, one who shares information. The human equivalent of a security camera, but messier and more expensive.

⚖️ Legal

Advanced

Contra proferentem

A rule that ambiguous contract terms are interpreted against the party who drafted them. It rewards careful drafting and punishes anyone who wrote 'reasonable efforts' without defining it.

⚖️ Legal

Intermediate

Tort

A civil wrong that is not a crime but still gets you sued, and no, it has nothing to do with the delicious layered cake despite sounding identical. The legal system's way of saying "that was not cool, now pay up."

⚖️ Legal

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