E-commerce — with a hyphen — is the standard spelling in formal American English. It is the form listed in Merriam-Webster, the Oxford English Dictionary, Collins, Cambridge, and Britannica. The AP Stylebook explicitly requires the hyphenated form for generic e- terms and names email as the one exception to that rule.
Ecommerce (no hyphen) is the dominant form in digital marketing, industry content, and informal writing. It is not wrong. But it is not what major dictionaries list, and it is not what the AP Stylebook requires. If you write for publication or under a style guide, use e-commerce. If you run a brand, manage a website, or write for an industry audience with no formal style guide, ecommerce is widely used and clearly understood.
eCommerce with a capital C is a branding and software convention — not a standard English form. Avoid it in general writing. E commerce with a space is never correct.
Where the Word Came From
Understanding the spelling debate starts with understanding how the word was born.
The term “electronic commerce” was coined and first employed by Robert Jacobson in the title and text of California’s Electronic Commerce Act, enacted in 1984. For the next decade, the full phrase electronic commerce was standard in business and regulatory writing. Wikipedia
The abbreviation e-commerce emerged in the 1990s, when a wave of internet terminology compressed “electronic” down to the prefix e-. Email (then e-mail), e-business, e-reader, e-book, and e-commerce all followed the same hyphenation convention: the e- signaled that an otherwise familiar noun had gained an electronic dimension. The hyphen made the e- readable as a standalone prefix rather than the start of a new word.
That convention has held for most e- terms. Email is the prominent exception — and the most common source of confusion about whether e-commerce should follow.
Why Email Dropped Its Hyphen and E-commerce Hasn’t
The original article for the AP Stylebook and Chicago Manual of Style both note that email is an explicit exception to the e- hyphenation rule — not a precedent. But why?
Email crossed to closed form because it crossed two thresholds: extreme frequency and conceptual independence. People use email dozens of times a day. It stopped feeling like “electronic mail” and became its own thing — distinct from a text, a chat, a message. The AP Stylebook’s 2011 announcement that “email” would replace “e-mail” specified that other e- terms such as e-book and e-commerce retain the hyphen. Poynter
E-commerce is used far less frequently in casual writing than email, and it has not yet developed the same level of conceptual independence. When someone says e-commerce, the “electronic” element is still doing real descriptive work — distinguishing it from commerce in the traditional, physical sense. That is exactly the condition under which English keeps the hyphen.
Language does shift. Ecommerce is gaining ground, and some dictionaries may eventually list it as the primary form. As of 2026, they haven’t.
What the Style Guides and Dictionaries Say
The AP Stylebook
The AP Stylebook states: “AP uses hyphenated e- for generic terms such as e-commerce and e-strategies. One exception: email (no hyphen, which reflects majority of usage). For company names, use their preference: eBay.” This language is precise and worth reading closely. The AP explicitly calls out e-commerce and e-strategies as examples of the hyphenated standard, and it explicitly names email as the exception. There is no ambiguity here. Lengow
Merriam-Webster
Merriam-Webster lists e-commerce as its primary dictionary entry. Because both the AP Stylebook and the Chicago Manual of Style defer to Merriam-Webster as their preferred spelling reference, M-W’s entry for e-commerce carries weight across multiple style systems simultaneously.
The Chicago Manual of Style
Chicago does not have a separate style entry for e-commerce and defers to Merriam-Webster for spelling, which lists the hyphenated form. In practice, editors following CMOS use e-commerce.
British and International Dictionaries
The Oxford English Dictionary, Collins, Cambridge, and Britannica all list e-commerce as the standard entry. The hyphenated form is not an American preference — it is the global dictionary standard.
How Major Brands Spell It
One of the most instructive things about this debate is how the two largest e-commerce platforms in the world have landed on opposite sides of it.
Amazon adheres to the traditional “e-commerce” in its official communications, while Shopify consistently favors the streamlined “ecommerce.” Amazon — founded in 1994, listed on stock exchanges, and subject to formal reporting requirements — follows the dictionary standard. Shopify, a platform built from the ground up as a digital-native product, uses “ecommerce” throughout its own content and documentation. LengowShopify
This split maps almost perfectly onto the formal/informal divide: e-commerce for institutional, regulatory, and journalistic contexts; ecommerce for product marketing, digital content, and brand writing.
When a brand name itself contains the word — WooCommerce, BigCommerce — use the brand’s own capitalization and spelling. That is what the AP Stylebook instructs for company names, and it is common sense for proper nouns.
The SEO Dimension
This is a spelling question that comes with an unusual practical wrinkle: both spellings are actively used as search terms, and they don’t behave identically in search engines.
According to Semrush data, “ecommerce” (without a hyphen) has higher search volume in the US than “e-commerce,” and the same pattern holds in the UK. For a word that lives almost entirely in digital contexts — and is searched by people building online stores, writing marketing content, and pitching investors — that search volume gap matters. Lengow
Search engines generally understand both spellings and treat them as related, but they are not always treated as fully identical queries. For a blog, help center, or brand resource aimed at a digital audience, ecommerce may be the more search-friendly choice even though e-commerce is the dictionary form. For content published by a news organization, academic journal, or formal publication, e-commerce is required.
The practical takeaway: if you have a style guide, follow it. If you don’t, consider your audience. A grammar article for writers belongs under e-commerce. A Shopify store help page belongs under ecommerce. Either way, pick one form and use it consistently across every URL, headline, body copy, and metadata field.
Capitalization Rules
In a sentence: always lowercase e-, never capitalize the c: The company launched an e-commerce platform in 2022.
At the start of a sentence: capitalize the E, keep the hyphen, keep the c lowercase: E-commerce sales topped $6 trillion globally in 2024.
In title case headlines: capitalize the E and the C only if your publication’s title case rules require capitalizing both parts of a hyphenated compound. Under most American title case conventions: E-Commerce Trends for 2026 — but check your specific style guide, as rules vary.
The wrong form in any context: eCommerce is CamelCase — a styling convention used in software naming, brand identity, and marketing materials where a capital letter mid-word signals a compound without punctuation. It is not a standard English spelling and does not belong in edited prose.
A Practical Guide for Content Teams
If you manage content across a website, newsletter, or publication, the spelling debate is really a style sheet question. Here is how to handle it:
Formal publications and news organizations: Use e-commerce throughout. This matches AP style, dictionary entries, and international press conventions.
Brand websites and marketing content: Choose one form — either e-commerce or ecommerce — and document it in your style guide. Apply it consistently across all URLs, navigation labels, page titles, and body text. Inconsistency across these elements creates both editorial and minor technical SEO problems.
Academic and legal writing: Use e-commerce. It is the form in Merriam-Webster and all major style guides. No legal brief or academic paper should use the closed form without a style authority to back it.
No style guide at all: Ecommerce is the more common form in digital-native content and has higher search volume. It’s a defensible choice for informal or commercial writing. Just don’t mix it with e-commerce in the same document.
FAQs
Does Merriam-Webster prefer e-commerce or ecommerce?
Merriam-Webster lists “e-commerce” as the correct spelling with a hyphen, aligning with its general convention of hyphenating terms with the e- prefix. The unhyphenated form does not appear as a primary entry. Emailaudience
What does the AP Stylebook say about e-commerce?
The AP Stylebook specifies the use of hyphenated e- for generic terms such as e-commerce and e-strategies. Email is the named exception to this rule, not a model for other e- words. For company names, the AP says to follow the company’s own preference — as with eBay. Paperform
Is ecommerce wrong?
Not wrong — it is widely used, clearly understood, and used consistently by major platforms including Shopify. But it is not the form listed in major dictionaries or required by the AP Stylebook. In formal or edited writing, e-commerce is the standard. In digital marketing and brand content, ecommerce is the norm.
Is eCommerce with a capital C acceptable?
Not in standard American English writing. eCommerce is CamelCase — a styling convention used in software naming and some brand identities. It follows no established English grammar convention and does not appear in any major dictionary as a recognized form.
Will ecommerce eventually replace e-commerce, the way email replaced e-mail?
Possibly, but the conditions aren’t yet met. Email crossed to closed form because it became conceptually independent — nobody thinks of it as “electronic mail” anymore — and because it was used so frequently that the hyphen felt like friction. E-commerce has not reached that level of frequency or cognitive independence in formal writing. Dictionaries and style guides will move when usage data justifies the change. As of 2026, it hasn’t.
Which spelling is better for SEO?
Semrush data shows “ecommerce” without a hyphen has higher search volume than “e-commerce” in the US. For digital-native content targeting people searching for online selling topics, ecommerce may have a slight advantage as a keyword. For formal editorial content, e-commerce is required regardless of search volume. Either way, consistency across all content and metadata is more important than which specific form you choose. Lengow
How do I capitalize e-commerce at the start of a sentence?
Capitalize the E and keep the rest lowercase: E-commerce sales grew significantly last year. Never capitalize the c after the hyphen unless you are following a title case convention that requires it.
The Bottom Line
E-commerce is the dictionary-standard spelling and the form required by the AP Stylebook, backed by Merriam-Webster, the Oxford English Dictionary, Collins, Cambridge, and Britannica. Ecommerce is widely used in digital and industry contexts, has higher search volume in the US, and is the house style of major platforms including Shopify. Both are defensible choices depending on context and audience.
eCommerce and e commerce have no place in professional writing. Choose e-commerce for formal and editorial work. Choose ecommerce for digital-native content if that matches your audience and style guide. Document your choice, apply it consistently everywhere — body copy, URLs, navigation, metadata — and move on.
Conclusion
E-commerce is the standard spelling in formal American English. It is the form listed in Merriam-Webster, the Oxford English Dictionary, Collins, and Britannica. The AP Stylebook requires it for generic e- prefix terms and treats email as an exception, not a precedent for this word.
Ecommerce without the hyphen is common in industry and informal writing. It is not an error, but it is not the dictionary-backed form.
Avoid eCommerce and e commerce entirely in professional writing. Choose e-commerce or ecommerce, apply it consistently, and move on.
