organize: Style Guide Spelling Decisions (AP, Chicago, MLA, APA)

How major style guides rule on "organize"

American -ize, British often -ise. Oxford English Dictionary actually prefers -ize even in British English.

The disagreement on "organize" is an example of systematic American vs British English differences, the category of style-guide differences that most often confuses copy editors and creates inconsistency across long documents. Below is a guide-by-guide breakdown, drawn directly from the published editions cited.

What the divergence actually means

Unlike many compound-modernization decisions where style guides eventually converge, "organize" continues to show genuine divergence between major guides. The AP Stylebook treats this as a settled call; Chicago Manual leaves more flexibility; and Merriam-Webster, as a descriptive dictionary, records both forms. Source: Chicago Manual of Style, 17th Edition

The APA Publication Manual aligns with AP and Chicago on "organize", though APA generally addresses spelling questions only when they intersect with statistical reporting or technical psychology vocabulary. Where the manual is silent, APA defers to Merriam-Webster as its standard reference. Source: APA Publication Manual, 7th Edition

Merriam-Webster lists "organize (UK: organise)", which serves as the lexicographic baseline for U.S. style decisions. Because Merriam-Webster's entries reflect aggregated published usage rather than editorial preference, when a guide says "follow Merriam-Webster", as APA does, that effectively delegates the call to whichever spelling has dominated the published corpus. Source: Merriam-Webster Dictionary

Garner's Modern English Usage classifies the "organize" / "organise" pair on its Language-Change Index, a five-stage scale measuring whether a once-disputed form has been accepted into Standard English. For systematic American vs British English differences, Garner's typically rates the dominant form at Stage 4 ("ubiquitous but objected to by traditionalists") or Stage 5 ("fully accepted"). Source: Garner's Modern English Usage, 5th Edition

Practical guidance for editors

For working writers, the practical rule is straightforward: in journalism, follow AP; in academic writing in the humanities, follow MLA or Chicago; in social-science publishing, follow APA; in book publishing, follow Chicago. When no house style applies, Merriam-Webster's main entry is the safest default. The differences across these guides on "organize" reflect not disagreement about correctness but different audiences and editorial pressures.

Editorial context

Although the Oxford English Dictionary has long preferred organize in British English to reflect its etymological roots in Greek -izein, a tenacious register split persists between scholarly and journalistic usage, with the latter favoring organise. This divide solidified in the late 19th century when publishers like Macmillan and newspapers adopted -ise for visual consistency and alignment with non-Greek verbs like advertise, overriding Oxford's classical pedantry. British broadsheets such as The Guardian and Daily Telegraph maintain strict house styles mandating organise, even as Oxford University Press publications adhere to -ize. Consider a typical news lead: Campaigners will organise a rally against the new policy. Google Books Ngrams data reveal organise eclipsing organize in British English by the mid-20th century, a trend that underscores how editorial tradition in high-volume news production trumps dictionary prescription, creating ongoing challenges for transatlantic copy desks harmonizing content.

Cross-references

For the dictionary entry, frequency data, and pronunciation of organize, see the main word page. For other style-guide spelling decisions in this category, browse all style-guide spelling rulings.