Law Vocabulary
Part of the Society & Culture vocabulary group in Teacher-In-A-Box, this lesson explores the vocabulary used to describe legal systems, rights, contracts, and legal processes — in a neutral, descriptive way, using generic situations rather than any real case or dispute.
Connected vocabulary, not a glossary
Legal vocabulary works as a system.
Legal language moves between related ideas: a contract sets out obligations, a breach of that contract can lead to a lawsuit, and a legal dispute may lead to a court decision or verdict based on the evidence presented.
This lesson is not about any real case, crime, or dispute. It groups vocabulary by what it’s used to describe — the legal system, criminal and civil law, rights and contracts, and legal processes — and shows how the words in each area relate to and differ from one another.
You will leave this lesson able to describe legal situations more precisely, whether you’re reading a news report, a workplace policy, or an everyday agreement.
Legal systems and terminology vary between countries, so this lesson focuses on widely used English vocabulary rather than the law of any one jurisdiction.
1. The legal system
The rules a society uses, and how they’re created.
legal system — the complete set of courts, laws, and institutions a country uses to create and enforce rules: “Every country has its own legal system.”
court — the place, and the institution, where legal cases are decided: “The case was heard in a local court.”
regulation — a specific, detailed rule, usually created by an authority to control how something is done: “The company must follow safety regulations.”
law vs. legislation vs. regulation
Three related words that describe rules at a different level of detail.
law — a general, binding rule within a legal system: “It’s against the law to drive without a licence.”
legislation — laws considered as a body, especially newly created ones: “New legislation was introduced to protect consumers.”
regulation — a specific rule, often more detailed and practical, that puts a law into effect: “The regulations explain exactly how the law must be followed.”
2. Criminal law and civil law
Two different kinds of legal case, with different vocabulary.
defendant — the person or organisation a legal case is brought against, in either a criminal or civil case: “The defendant appeared in court on Monday.”
plaintiff — the person or organisation that brings a civil case against another party: “The plaintiff claimed the company had breached the contract.”
prosecution — the side that brings a criminal case, on behalf of the state: “The prosecution presented its evidence first.”
criminal law vs. civil law
In many legal systems, criminal law deals with offences prosecuted by the state, while civil law commonly deals with disputes between people or organisations. Exact procedures and terminology vary by jurisdiction.
criminal law — commonly deals with actions considered harmful to society as a whole, prosecuted by the state; a person found responsible is often described as guilty: “Theft is typically dealt with under criminal law.”
civil law — commonly deals with disputes between individuals or organisations, such as contracts or property; a party found responsible is typically described as liable, rather than guilty: “The contract dispute was settled under civil law.”
crime vs. offence
crime and offence (British English) / offense (American English) are both used for acts prohibited by criminal law. The exact distinction between the terms, and how serious they sound, varies by legal system and variety of English: “Theft is a crime.” / “Parking here without a permit is a minor offence.”
3. Rights, obligations and contracts
Some agreements create legally enforceable obligations.
obligation — something a person or organisation is legally required to do: “The tenant has an obligation to pay rent on time.”
terms and conditions — the specific rules and details that make up a contract or agreement: “Read the terms and conditions before signing.”
legally binding — describes an agreement that the law will enforce: “The agreement is legally binding on both parties.”
breach (noun/verb) — a failure to follow the terms of a contract or law: “Missing three payments was considered a breach of contract.”
contract vs. agreement
agreement — a general understanding or arrangement between parties, which may or may not create legal obligations: “They reached an informal agreement to share the cost.”
contract — an agreement that creates legally enforceable obligations; contracts are often written, but they are not necessarily written in every legal system: “She signed a contract with her new employer.”
4. Legal processes
A dispute moves through several stages before it’s resolved.
One possible legal process:
evidence (uncountable) — facts, documents, or testimony used to prove or disprove something in court: “The lawyer presented new evidence.”
testify — to give a formal, spoken account of what you know as part of a legal case: “The witness testified about what she had seen.”
settle — to resolve a dispute by agreement, without a full trial or verdict: “The two companies settled the case out of court.”
appeal — a formal request for a higher court to review a decision: “The company said it would appeal the decision.”
guilty vs. liable · sue vs. prosecute
guilty — the verdict in a criminal case, when a person is found responsible for a crime: “He was found guilty of the offence.”
liable — the outcome in a civil case, when a person or company is found responsible for a breach, debt, or harm: “The company was found liable for the faulty product.”
sue — to bring a civil case against someone, usually to claim money or another remedy: “She sued her landlord over the deposit.”
prosecute — to bring a criminal case against someone, on behalf of the state: “The state chose not to prosecute in this instance.”
5. Legal roles
Who’s who in a legal case.
judge — the official who oversees a court case and decides on matters of law: “The judge explained the process to both sides.”
jury — in legal systems that use juries, a group of members of the public who decide questions of fact in certain cases: “The jury reached its verdict after two days.”
witness — a person who saw something relevant to a case, or who gives evidence about it: “Two witnesses were called to testify.”
lawyer — a broad term for a legal professional; attorney is especially common in American English, while professional titles vary between legal systems: “She hired a lawyer to review the contract.”
Vocabulary in context
See the vocabulary working together.
Here is a short, neutral passage using several words from this lesson together.
A supplier and a retailer disagreed over the terms of their contract. The retailer argued the supplier had breached the agreement by delivering late, and sued for the money it had lost as a result. Both sides presented evidence to the court, but before a verdict was reached, they agreed to settle out of court.
Unpacking what this vocabulary communicates:
disagreed over the terms of their contract → a civil dispute, not a criminal one.
breached the agreement → one side failed to meet an obligation it had agreed to.
sued → a formal legal case was brought, seeking a remedy.
presented evidence to the court → both sides supported their claims with facts, not opinions.
settle out of court → the case was resolved by agreement, without a final verdict.
The passage presents a routine business disagreement, not a dramatic or violent event — that ordinary framing is deliberate, since most legal vocabulary in everyday and workplace English describes disputes like this one.
Don’t confuse these
Choosing the right word changes what a sentence communicates.
law / legislation / regulation
Ask: is this a general binding rule (law), laws as a body, often newly made (legislation), or a specific detailed rule that implements a law (regulation)?
criminal law / civil law
In the distinction used in this lesson, ask: is this an offence prosecuted by the state (criminal), or a dispute between people or organisations (civil)?
contract / agreement
An agreement is a general understanding, which may or may not be legally binding; a contract is an agreement that creates legally enforceable obligations.
guilty / liable
Guilty is a criminal-case verdict; liable is the civil-case equivalent, used for contracts, debts, and harm.
sue / prosecute
In the usage taught here, a person or organisation may sue another party in a civil case; the state prosecutes a criminal case.
Natural word partnerships
These combinations are worth learning as fixed units.
For the general idea behind combinations like these, see:
Common errors
Mistakes are useful when you understand why they happen.
The jury found him innocent.
The jury found him not guilty.
In criminal-case English, “guilty” and “not guilty” are the standard verdict terms — “innocent” isn’t used this way.
The police collected several evidences at the scene.
The police collected several pieces of evidence at the scene.
“Evidence” is uncountable — it’s never pluralised.
She lawsuited her former employer.
She sued her former employer.
“Lawsuit” is a noun; the verb is “sue” (or “file a lawsuit against”).
The company was found guilty of breaching the contract.
The company was found liable for breaching the contract.
In a civil case, the usual term is “liable,” not “guilty.” “Guilty” is used for criminal responsibility.
He was in breach with the contract.
He was in breach of the contract.
The fixed preposition is “in breach of,” not “in breach with.”
Your turn
Choose the word that fits.
These activities are part of the learning process. There are no scores, no grades and no limit on how many times you may try.
A dispute between two businesses over an unpaid invoice would normally be dealt with under…
Is this a dispute between two parties, or an act considered harmful to society as a whole?
“An agreement that creates legally enforceable obligations, setting out what each side must do.” Which word best fits?
Is this describing a general understanding, or an agreement that creates legal obligations?
In a civil case about a broken contract, the usual term for responsibility is ___, rather than guilty.
Which word is used for responsibility in a civil, rather than criminal, case?
Try it another way
Complete the sentences.
Type the word that fits each gap.
Notice the difference
Rewrite each sentence using the correct word.
The jury found him innocent.
The police collected several evidences at the scene.
Alternate practice
Use the vocabulary productively, not just recognise it.
Complete the summary
Fill each gap with one word from this lesson: breached, sued, evidence, liable, settled.
“After the supplier ___ the contract, the retailer ___ for the money it had lost. Both sides presented ___ to the court, but before a verdict was reached, they ___ the case — the supplier was found ___ and agreed to pay.”
Sort into groups
Sort these words into the area they belong to (Legal System / Criminal & Civil Law / Contracts / Legal Processes):
Describe a situation
In two or three sentences, describe a fictional legal situation using at least four words from this lesson.
Quick review
Five areas, connected by process and precision.
The legal system — law vs legislation vs regulation, and how courts fit together.
Criminal & civil law — crime vs offence, and how criminal cases differ from civil ones.
Rights, obligations & contracts — obligation, breach, legally binding, and contract vs agreement.
Legal processes — vocabulary for lawsuits, court decisions, settlements, and appeals, along with guilty vs liable.
Legal roles — judge, jury, witness, and lawyer vs attorney.
Watch for — guilty vs liable, contract vs agreement, sue vs prosecute.
Remember
Legal vocabulary describes a system, not wrongdoing.
Words like contract, breach, liable and verdict describe how legal processes work — you’ll meet this vocabulary in everyday contexts like tenancy agreements, workplace policies, and news reports, not only in courtrooms.
Related vocabulary
Explore related areas of vocabulary.
Explore the rest of the Society & Culture vocabulary group below.