Prioritize vs. Prioritise
“Prioritize” and “prioritise” are the same verb; Cambridge notes that UK English usually uses “prioritise,” while “prioritize” is standard in US-oriented English. Do not invent a meaning difference between the spellings; the choice is orthographic and regional.
“Prioritize” and “prioritise” are the same verb; Cambridge notes that UK English usually uses “prioritise,” while “prioritize” is standard in US-oriented English.
Key details
Choose the right form
| Regional style | Use | Reason |
|---|---|---|
| US-oriented English | prioritize | Standard US-oriented spelling. |
| UK-oriented English | prioritise | Cambridge notes this as the usual UK form. |
| House style | follow the specified -ize/-ise policy | The forms are spelling variants of the same verb. |
Quick tests
Regional-spelling test
Is the document following an established US or UK spelling system?
If yes: Use the matching form and keep it consistent.
If no: If the publication specifies its own -ize/-ise policy, follow that house style.
Caveat: Do not invent a meaning difference between the two spellings.
Examples
We need to prioritize the critical fixes.
US-oriented spelling.
We need to prioritise the critical fixes.
UK-oriented spelling.
The two forms should not be used to signal different meanings.
They are regional spelling variants.
Further guidance
Core difference
“Prioritize” and “prioritise” are the same verb; Cambridge notes that UK English usually uses “prioritise,” while “prioritize” is standard in US-oriented English.
Fast Test
Match the spelling to the document’s regional or house style and use it consistently.
Usage Boundary
Do not invent a meaning difference between the spellings; the choice is orthographic and regional.
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.
- Prioritize — Cambridge Dictionary (opens in a new tab)Cambridge University Press · Learner-dictionary evidence that prioritize/prioritise are regional spellings of the same verb and that UK English usually uses prioritise.