Plural of Matrix
“Matrix” has two dictionary-recorded plurals: “matrices” and “matrixes.” This applies across general English, though a particular mathematical, technical, medical, or house style may prefer one. Follow the controlling style when there is one; otherwise do not mark either dictionary-recorded plural as universally wrong.
Both “matrices” and “matrixes” are accepted plurals of “matrix.”
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| one matrix | matrix | Singular. |
| more than one | matrices | Accepted plural. |
| more than one | matrixes | Also accepted. |
Quick tests
Plural-choice test
Are you referring to more than one matrix?
If yes: Use accepted “matrices” or “matrixes,” subject to style.
If no: Use singular “matrix.”
Caveat: Specialist conventions can narrow local choice without changing the general dictionary status of both forms.
Examples
The calculation uses three matrices.
“Matrices” is an accepted plural.
The printer stores several matrixes.
“Matrixes” is also dictionary-recorded.
This matrix contains the coefficients.
One takes singular “matrix.”
Further guidance
Core difference
Use “matrices” or “matrixes” for more than one matrix, subject to local style.
Fast Test
If a specialist or house style specifies one form, follow it; otherwise both are accepted.
Usage Boundary
Do not label “matrixes” incorrect merely because “matrices” is common in some technical contexts.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- MATRIX Definition & Meaning - Merriam-Webster (opens in a new tab)Merriam-Webster · Merriam-Webster records plural matrices or matrixes.
- MATRIX | English meaning - Cambridge Dictionary (opens in a new tab)Cambridge University Press · Cambridge records both matrices and matrixes as plurals of matrix.