How major style guides rule on "dialogue"
Most American style guides keep the '-ue' ending; 'dialog' survives mainly in computing ('dialog box').
The disagreement on "dialogue" 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.
| Style guide | Preferred form |
|---|---|
| AP Stylebook (2024–2025 Edition) | dialogue |
| Chicago Manual of Style | dialogue |
| MLA Handbook | dialogue |
| APA Publication Manual | dialogue |
| Merriam-Webster Dictionary | dialogue (also dialog) |
What the divergence actually means
Unlike many compound-modernization decisions where style guides eventually converge, "dialogue" 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 "dialogue", 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 "dialogue (also dialog)", 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 "dialogue" / "dialog" 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 "dialogue" reflect not disagreement about correctness but different audiences and editorial pressures.
Editorial context
In computing, the spelling dialog endures as the standard for interactive user interface elements, notably the dialog box, originating in 1970s graphical systems like the Xerox Alto at PARC and gaining ubiquity with Microsoft Windows 1.0 in 1985. This technical register prioritizes conciseness and precedent over general editorial norms, appearing consistently in APIs, documentation, and web standards such as the HTML5 <dialog> element specced by the WHATWG in 2011. The application displays a dialog prompting the user to confirm deletion. Software localization guides and developer communities reinforce this form worldwide, creating a lexical silo where dialog outpaces dialogue even in U.S. tech writing, as evidenced by dominant usage in repositories like GitHub and Stack Overflow. This industry-specific persistence highlights how domain jargon can sustain variant spellings amid broader orthographic standardization.
Cross-references
For the dictionary entry, frequency data, and pronunciation of dialogue, see the main word page. For other style-guide spelling decisions in this category, browse all style-guide spelling rulings.