Quick answer: Authority is the legitimate right to give orders or make decisions, granted by a role, law, or position: The manager has the authority to approve leave. Power is the ability to influence or control — whether legitimate or not: The dictator held enormous power. When in doubt: AUTHORITY = the right; POWER = the ability. For a fuller definition, see the Cambridge Dictionary entry for ‘authority’.
Comparison Table
| Word | Part of Speech | Meaning | Example |
|---|---|---|---|
| authority | noun | the legitimate right to give orders, make decisions, or enforce rules | Only the court has the authority to decide. |
| power | noun | the ability to influence, control, or affect outcomes, legitimate or not | Wealth gave the family great power. |
Using Authority
Authority stresses legitimacy — a right that comes from a position, law, role, or institution. If you have authority, others recognise that you are entitled to make certain decisions or give certain orders. It is often something granted to you.
The police have the authority to make arrests.
She doesn’t have the authority to sign this contract.
The committee was given full authority over the budget.
He spoke with the authority of an expert.
Notice that authority can be delegated (“given full authority”) and is tied to recognised legitimacy. Authority also has other senses: an expert (“a leading authority on climate”) or an official body (“the local authority”).
Authority Can Be Delegated
Because authority is a granted right, it can be passed down a chain: a director delegates authority to a manager, who delegates it to a team leader. Each holds the legitimate right to make decisions within defined limits.
The CEO delegated authority to the regional directors.
You’ll need written authority from head office.
Using Power
Power stresses ability and influence, regardless of whether it is legitimate. A person, group, or country can have power through wealth, force, knowledge, charisma, or position. Power can be used well or abused, and it does not always come with the right to use it.
The general seized power in a coup.
Knowledge is power.
The media has enormous power to shape opinion.
She has the power to change people’s minds.
Power Without Authority — and Vice Versa
The two can come apart. A protest movement may have real power to change policy without any official authority. A junior official may have authority on paper but little real power to enforce decisions. The clearest cases — legitimate governments, valid managers — have both.
Key Differences at a Glance
- Legitimacy: Authority is always legitimate; power may or may not be.
- Source: Authority comes from a role, law, or position; power can come from force, wealth, or influence.
- Right vs ability: Authority is the right to act; power is the ability to act.
- Transfer: Authority is delegated; power is seized, held, or built.
Side-by-Side Examples
The minister has the legal authority to issue the order.
The minister has the power to make it actually happen.
A rebel leader can have power without legal authority.
A weak official may have authority but little real power.
Common Mistakes
✗ I don’t have the power to approve your refund.
✓ I don’t have the authority to approve your refund. (you lack the right)
✗ The army took authority by force.
✓ The army took power by force.
✗ Believing anyone with authority automatically has real power.
✓ He had the authority on paper but no power to enforce it.
Memory Tip
Link AUTHORITY with AUTHORISE — both share the idea of an official, legitimate right that is granted. POWER is about being able to make things happen, like an engine’s power — pure ability, with or without permission.
Frequently Asked Questions
What is the main difference between authority and power?
Authority is the legitimate right to give orders or make decisions, granted by a role, law, or position. Power is the ability to influence or control, whether legitimate or not. In short, authority is the right to act, while power is the ability to act. The clearest cases of leadership combine both.
Can you have power without authority?
Yes. A protest movement, a wealthy individual, or a charismatic figure may have real power to influence events without any official authority. Conversely, someone may have legal authority on paper but little practical power to enforce decisions. The two often, but not always, go together.
Is authority always legitimate?
By definition, authority implies legitimacy — it is a recognised right granted by law, role, or institution. Power, by contrast, can be legitimate or illegitimate. A government holds authority; a gang holds power through force but lacks legitimate authority.
Can authority be delegated?
Yes. Because authority is a granted right, it can be passed down a chain of command. A director delegates authority to a manager, who delegates it to a team leader. Each holds the legitimate right to decide within defined limits. Power is not delegated in the same formal way.
Does authority have other meanings?
Yes. Besides the right to act, authority can mean an expert (“a leading authority on history”) or an official organisation (“the local authority,” “the health authority”). The core idea of recognised legitimacy runs through all these senses.
Does power have other meanings?
Yes. Beyond control over people, power means energy (“electric power,” “solar power”), mathematical exponent (“two to the power of three”), and physical strength or capability (“engine power”). The shared idea is the ability to produce an effect.
Which word fits “I can't approve this” at work?
Authority. When you cannot approve something because it is not within your role, you say “I don’t have the authority to approve this.” This shows you lack the legitimate right, not necessarily the ability. Using “power” here would sound slightly wrong.
How do politicians use these words?
Politicians “seize power,” “come to power,” or “lose power,” describing control of government. They are “given authority” or “act within their authority,” describing the legitimate limits of their role. A legitimate government has both; a coup grabs power without proper authority.
What are the adjective forms?
The adjective related to authority is authoritative (“an authoritative source”) or authoritarian (“an authoritarian regime,” with a negative tone). The adjective from power is powerful (“a powerful leader”). Note that authoritative and authoritarian have very different meanings.
How can I remember the difference for exams?
Link AUTHORITY with AUTHORISE — both share the idea of an official, legitimate right. POWER is about being able to make things happen, like an engine’s power, with or without permission. In essays, use authority for legitimate rights and power for influence or ability.