What does captioning mean?
Captioning is the process of supplying written text alongside visual media — most commonly the transcription of spoken dialogue into on-screen subtitles for films, television programmes, and online videos. Its best-known form, closed captioning, was developed to make broadcasting accessible to deaf and hard-of-hearing audiences, conveying not only dialogue but also sound effects, music cues, and speaker changes. Beyond accessibility, captioning has become widespread among general viewers, many of whom watch with captions enabled by default in noisy environments or when learning a language. The term also applies more broadly to writing brief explanatory text beneath photographs, illustrations, and social media posts. Captioning is a neutral, professional word, common in media production, education, and technology contexts, where phrases such as "live captioning" and "automatic captioning" describe real-time or machine-generated services. It is treated as an uncountable noun.
nounThe act or process of adding captions — brief explanatory text or subtitles — to images, films, broadcasts, or other media, especially the display of dialogue as on-screen text for deaf and hard-of-hearing viewers.
- The process of providing textual captions for video, film, television, or live broadcasts, particularly for accessibility purposes.
- More generally, the act of writing short explanatory text accompanying photographs, illustrations, or social media posts.
"Live captioning of the news broadcast made the program accessible to deaf viewers."
"Automatic captioning on video platforms has made online content far more accessible to deaf audiences."
"She spent the afternoon captioning the museum's archive of historic photographs."
Closed captioning was born in the late 1970s from an unlikely partnership between PBS and the U.S. government — and today it's used by millions of viewers who aren't deaf at all.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of captioning
Captioning derives from "caption," which entered English in the early 17th century meaning a heading or title of a legal document, borrowed from Latin "captio" (a catching or seizing), from the verb "capere" (to take). The extended sense of a descriptive heading for an illustration developed later, and "captioning" emerged in the twentieth century to name the activity itself, gaining prominence with the rise of television subtitling for the deaf in the late 1970s. The word shares its Latin root with "capture," "captive," and "capsize."
Related word forms
How captioning is actually used
"Captioning" is chiefly used in professional, media, and accessibility contexts; it is neutral in register. In everyday speech about photos, people more often say "writing captions," while "closed captioning" is the fixed term for broadcast subtitling for the hearing-impaired. The word is almost always uncountable.
Easily confused with captioning
A caption is the text itself; captioning is the process or practice of producing and displaying such text.
Subtitling typically renders translated or transcribed dialogue at the bottom of a screen, whereas captioning (especially closed captioning) also conveys non-speech audio information such as sound effects and speaker identification.