Plural of Pyjamas
In the ordinary sleepwear sense, “pyjamas” is a plural noun and normally takes plural agreement. Count one set as “a pair of pyjamas” and more than one as “pairs of pyjamas.” The spelling “pajamas” is standard in US English; this guide addresses number and agreement rather than the regional spelling choice.
For sleepwear, “pyjamas” is plural in form. One set is normally “a pair of pyjamas”; US English spells the word “pajamas.”
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| sleepwear generally | pyjamas | Plural-form noun. |
| one sleepwear set | a pair of pyjamas | Count the pair. |
| US spelling | pajamas / a pair of pajamas | Same number pattern, different spelling. |
Quick tests
Plural-choice test
Are you referring to the ordinary sleepwear set?
If yes: Use plural “pyjamas”; one set is “a pair of pyjamas.”
If no: Use the grammar of the other pyjama sense or the US spelling if that is the issue.
Caveat: This page does not replace the separate regional-spelling guidance for pajamas vs. pyjamas.
Examples
My pyjamas are on the chair.
The sleepwear noun takes plural agreement.
She packed a pair of pyjamas.
One set is counted as a pair.
In US English, he bought two pairs of pajamas.
The US spelling keeps the same pair-based number pattern.
Further guidance
Core difference
Use plural “pyjamas” for the sleepwear set and count one set as “a pair of pyjamas.”
Fast Test
If you are counting sleepwear sets, count pairs; choose pajamas instead only when following US spelling.
Usage Boundary
Do not create ordinary sleepwear singular “a pyjama” merely by removing the final -s; singular pyjama has other lexical/attributive uses.
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.
- Pyjamas — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · UK pyjamas form and US pajamas counterpart
- PYJAMA | English meaning - Cambridge Dictionary (opens in a new tab)Cambridge University Press · Cambridge records singular pyjama in other noun/adjectival uses, supporting the boundary that ordinary sleepwear pyjamas is not mechanically singularized in every context.