English UsageComparison guide
Emphasize vs. Emphasise
“Emphasize” and “emphasise” are regional spelling variants of the same verb. Cambridge lists “emphasize” and notes that UK English usually uses “emphasise,” so the choice is a spelling-style decision rather than a difference in meaning.
Both are accepted spellings of the same verb. “Emphasize” is standard in US-oriented writing; Cambridge notes that UK English usually uses “emphasise.”
Key details
Confusion Familyregional-variant
Termsemphasize, emphasise
Variant Scopesame verb; Cambridge marks UK usually emphasise
Further guidance
Core difference
The two forms share the same meaning; the -ize/-ise difference is orthographic.
Style Boundary
Match the document’s regional or house style instead of switching spellings unpredictably.
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.
- emphasize — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · Regional spelling evidence: emphasize, with UK usually emphasise