How major style guides rule on "e-commerce"
Style guides retain the hyphen; brand and tech industry usage often drops it (Shopify, BigCommerce).
The disagreement on "e-commerce" is an example of hyphenation rules for common prefixes, 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.
| Style guide | Preferred form |
|---|---|
| AP Stylebook (2024–2025 Edition) | e-commerce |
| Chicago Manual of Style | e-commerce |
| MLA Handbook | e-commerce |
| APA Publication Manual | e-commerce |
| Merriam-Webster Dictionary | e-commerce (also ecommerce) |
What the divergence actually means
Unlike many compound-modernization decisions where style guides eventually converge, "e-commerce" 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 "e-commerce", 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 "e-commerce (also ecommerce)", 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 "e-commerce" / "ecommerce" pair on its Language-Change Index, a five-stage scale measuring whether a once-disputed form has been accepted into Standard English. For hyphenation rules for common prefixes, 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 "e-commerce" reflect not disagreement about correctness but different audiences and editorial pressures.
Editorial context
In the computing and retail technology sectors, "ecommerce" endures as a common unhyphenated form, diverging from print-oriented editorial standards to suit digital interfaces and branding. Platforms such as Shopify, BigCommerce, and WooCommerce standardize on ecommerce across their APIs, style guides, and marketing materials, often to mirror seamless URL structures like shopify.com/ecommerce and avoid hyphen rendering issues in code or mobile views. This preference emerged prominently in the early 2000s amid web development practices, where developers favored compound forms without punctuation for cleaner scripting and database entries. A typical industry sentence reads: The developer implemented a new ecommerce checkout module using React. Legal documents in tech contracts sometimes follow suit, citing "ecommerce" clauses under laws like the U.S. E-SIGN Act, highlighting how specialized registers prioritize functionality and consistency over hyphenation conventions rooted in print traditions.
Cross-references
For the dictionary entry, frequency data, and pronunciation of e-commerce, see the main word page. For other style-guide spelling decisions in this category, browse all style-guide spelling rulings.