You open a philosophy book and hit words like ontology or empiricism. Feels heavy, right? The trick isn't memorising a dictionary — it's knowing the core terms that keep showing up.
Philosophy uses a specific set of English vocabulary. Get these ten right, and you'll handle most introductory texts without getting lost.
Let's get straight into them.
The Big Three: Ontology, Epistemology, Ethics
These three branches form the backbone of Western philosophy. If you understand them, you already understand half the book.
1. Ontology
The study of being and existence. What does it mean for something to exist?
Example: Plato's ontology separates the physical world from the world of ideals.
2. Epistemology
How do we know things? Epistemology asks what knowledge is and how we can be certain of anything.
Example: Descartes' epistemology starts with doubt — "I think, therefore I am."
3. Ethics
The study of right and wrong in human behaviour.
Example: Many ethics debates ask whether lying is ever morally acceptable.
These three branches connect like this:
Tools for Thinking: Logic & Metaphysics
These terms describe the "how" of philosophical reasoning — the methods philosophers use to build arguments.
4. Logic
The rules of correct reasoning. Logic helps you tell a strong argument from a weak one.
Example: "All humans are mortal. Socrates is human. Therefore, Socrates is mortal" — that's logic in action.
5. Metaphysics
Think of it as ontology's bigger cousin. Metaphysics looks beyond physics — at time, space, cause, and reality itself.
Example: Metaphysics asks whether time is real or just something our minds create.
Philosophical Approaches: Empiricism, Rationalism, Skepticism, Existentialism, Dialectic
These terms describe schools of thought — ways people have approached the big questions.
6. Empiricism
Knowledge comes from sensory experience. See it, touch it, then you know it.
Example: An empiricist would say you can't know that fire burns without having touched it.
7. Rationalism
The opposite of empiricism. Knowledge comes from reason and logic, not from the senses.
Example: A rationalist believes mathematical truths exist whether or not anyone sees them.
8. Skepticism
The habit of doubting. A skeptic doesn't accept claims without strong evidence.
Example: "You say this diet works? Show me the proof."
9. Existentialism
We create our own meaning in a meaningless universe. Life has no pre-made purpose.
Example: An existentialist would say you are free to define who you are — there's no "true self" to find.
10. Dialectic
A conversation method where two opposing views clash and produce a deeper truth.
Example: In a dialectic, you argue one side, then the other, and together you find something smarter.
Mini Exercise — Test Yourself
Match each term to its core idea:
| Term | Core Idea |
|---|---|
| 1. Ontology | a. Knowledge through reason |
| 2. Empiricism | b. The study of existence |
| 3. Rationalism | c. Knowledge through senses |
| 4. Ethics | d. Right and wrong |
(Answers: 1-b, 2-c, 3-a, 4-d)
Closing thought
You don't need to become a philosopher. But knowing these ten English philosophy vocabulary terms will make reading academic texts less intimidating and more rewarding.
Start with the words that feel most relevant to you. Use them in sentences. Talk about them with a friend. That's how vocabulary sticks.
Ready to check your English level for free? Test your reading, listening, writing, and speaking skills at English Measure.
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