/pi di ɛf/noun
pdf is spelled P-D-F: 3 letters and 3 syllables. It appears 6.9 times per million words in written English, the 9,045th most frequent word form (wordfreq, 2021 data). As a noun, pdf means “Initialism of probability density function” (English Wiktionary, September 2026). The plural of pdf is pdfs.
How many letters and syllables are in pdf?
| Letters | 3: P-D-F |
|---|---|
| Syllables | 3 (from its American pronunciation) |
| In writing | 6.9 times per million words; the 9,045th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is pdf?
Pdf appears 6.9 times per million words in written English, the 9,045th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce pdf?
- /pi di ɛf/
Pdf has 3 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-PDF.oga, Wikimedia Commons (author and licence on each file's page).
Forms of pdf
- pdfs plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does pdf mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
Initialism of probability density function.
- 2
Alternative letter-case form of PDF (“Portable Document Format”).
- 3
Alternative form of PDF file (“paedophile”).
noun
- 1
Initialism of Portable Document Format, a standard for representing electronic documents, allowing them to be transmitted and reproduced accurately with the same printed layout.
DjVu was developed at AT&T Research by Yan LeCun et al. in 1966. It generates files that are smaller than PDF files. […] PDF primarily encodes graphics and text as vectorized data, whereas DjVu primarily encodes them as pixmap images.
- 2
Initialism of portable document format (“a document in PDF format”).
- 3
Alternative letter-case form of pdf (“probability density function”).
- 4
Initialism of pop directional format.
verb
- 1
To convert (something) to PDF format.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).