English UsageComparison guide
Capitalize vs. Capitalise
“Capitalize” and “capitalise” are regional spelling variants of the same verb. Cambridge records the British “capitalise” variant, so writers should choose the form that matches their regional or publication style and use it consistently.
“Capitalize” and “capitalise” mean the same thing; select the spelling required by your regional or house style.
Key details
Confusion Familyregional-variant
Rule Familyregional-spelling
Termscapitalize, capitalise
Further guidance
Core difference
The spelling varies regionally; there is no separate general meaning created by changing -ize to -ise here.
Usage Boundary
Keep the chosen spelling consistent across the document or product instead of alternating forms without a style reason.
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.
- capitalize — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · Regional spelling note for capitalize/capitalise