What’s the Plural of Matrix: Understanding Singular and Plural Forms
Quick Answer
The plural of matrix is matrices. You can also say matrixes — both are correct. Matrices is more common.
One: This matrix shows the data.
Many: These matrices show the data.
Matrix, Matrices, Matrixes — See the Pattern
Look at these words. Can you see what happens?
- one matrix → two matrices
- one index → two indices
- one vertex → two vertices
- one appendix → two appendices
Did you see the pattern? These words all come from Latin. In Latin, words ending in -ix change to -ices for the plural. So matrix becomes matrices.
You can also use the normal English rule and add -es to get matrixes. Both are correct.
| One (singular) | More than one (plural) |
|---|---|
| matrix | matrices or matrixes |
| index | indices or indexes |
| vertex | vertices or vertexes |
| appendix | appendices or appendixes |
When to Use Matrices and When to Use Matrixes
Both words mean the same thing. But people use them in different places.
Use matrices when:
- You are writing for school, science, or math → “The matrices in this problem are 3 by 3.”
- You want to sound more formal → “We compared several matrices in the study.”
Use matrixes when:
- You are writing in everyday English → “The company uses different matrixes to track goals.”
- You want to keep things simple → “There are several matrixes in the report.”
Easy way to remember: If you are not sure, use matrices. It works everywhere and most people prefer it.
The Rule in One Line: Matrix → matrices (most common) or matrixes (also correct). Never “matrixs.”
How to Use Matrix in Everyday English
- The teacher drew a matrix on the board to explain the numbers. (one matrix)
- We need to solve three matrices for homework tonight. (more than one)
- The company uses a skills matrix to see what each person can do. (one matrix)
- Scientists compared the matrices from two different experiments. (more than one)
- Have you seen the film The Matrix? It uses the word to mean a computer world. (one matrix)
You are doing great. Now let’s look at the mistakes many learners make with this word.
Two Mistakes to Avoid With Matrix
Even advanced English learners get confused by Latin plurals — so if you mix these up, you are not alone. Most people have to learn this rule once and then it clicks.
Mistake 1: Adding just -s
✗ We solved five matrixs in class today.
✓ We solved five matrices in class today.
Mistake 2: Adding -ies
✗ The report contains several matrixies.
✓ The report contains several matrices.
How to remember: Think of the word “ice.” Matrix becomes matrices — you swap the -ix for -ices. Like adding “ice” to the end.
Other words that follow this pattern: index → indices, vertex → vertices, appendix → appendices, vortex → vortices.
Test Yourself: Matrix or Matrices?
Choose the correct answer for each sentence. Click Check to see if you are right.
1. There is only one _______ on the board.
2. The students need to solve three _______ for homework.
3. This _______ shows the sales numbers for each month.
4. The book explains five different _______.
5. Each _______ in the report had ten rows of data.
Keep Going — You Are Building Something
You just learned that matrix becomes matrices (or matrixes). That is one more tricky plural you will never get wrong again.
But here is something interesting. The word species also comes from Latin. So what is the plural? Is it “one species, two specieses“? Or does it follow a completely different rule? The answer catches most people off guard.
Next lesson: What Is the Plural of Species?
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My name is Khamis Maiouf. I am the creator of the English Teacher Site, dedicated to providing valuable resources and insights for students around the world. With a passion for education and a commitment to helping students enhance their skills, I aim to make English teaching more effective and enjoyable for both educators and students.
