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REFERENCE SOURCES

Sources & credits

APG combines pronunciation videos with dictionary references and quotations from books. Each reference links to its source. Practice sentences are original APG exercises and are labeled separately from book quotations.

What’s in the collection

The catalog contains 18,671 videos and 18,589 distinct word or title entries. It was retrieved on 2026-09-08.

A missing reference means we have not found a suitable match in this collection.

Pronunciation videos

Videos are embedded from the American Pronunciation Guide YouTube channel. They remain hosted by YouTube and retain their native controls. Each video page includes a direct link to YouTube.

Video catalog and publication dates

The public uploads playlist was followed to its final page. The catalog is a dated snapshot; it does not automatically add future uploads or check whether a video has been removed.

18,671 videos have verified publication dates from YouTube’s metadata. Those dates appear on their pages, in structured data, and in the video sitemap. We omit unverified dates.

YouTube and the respective rights holders retain their rights. Playback depends on availability and embedding permissions.

Definitions

Definitions come from English Wiktionary, with Princeton WordNet as a fallback. We show a small group of leading senses first; additional senses remain under “More meanings.” Source labels, including archaic and slang, are retained. Proper names and specialist meanings may differ from the everyday use of the same spelling.

Wiktionary material is extracted through Kaikki.org and Wiktextract. Definitions and IPA are attributed to Wiktionary contributors on each word page and remain available under CC BY-SA 4.0. We adapt formatting, grouping, and display order.

Fallback definitions use WordNet 3.0, Copyright 2006 by Princeton University. About WordNet · Full license and disclaimer

How definitions are selected

Only exact headword matches are imported. Unmarked dictionary senses generally appear before historical or uncommon uses. A few entries have explicit editorial priorities, such as the plant, origin, and cheering meanings of “root.” Other senses remain accessible; none are rewritten to fit a video.

The dictionary may include several meanings, and a book passage may illustrate any one of them. WordNet’s coverage of modern language and proper names is incomplete.

IPA and listening tips

On pages with a listening tip, the main IPA follows the pronunciation described in that tip. When a tip covers multiple pronunciations, its IPA section groups those forms with labels that explain the difference. Any remaining imported pronunciations appear under “Other dictionary pronunciations.” Guide and search cards show one representative IPA.

Most notes use dictionary entries. Selected names also draw on interviews and language references. When APG converts a written pronunciation cue into broad IPA or combines dictionary pronunciations for a name, this is labeled. Notes are not transcripts of the APG videos, and speakers may use different pronunciations.

Dictionary IPA comes from Wiktionary, the CMU Pronouncing Dictionary, and individually cited Cambridge Dictionary entries. An unqualified Wiktionary transcription is marked when its regional accent is unspecified. British, American, and native-language forms are labeled separately when compared.

CMUdict license and disclaimer

Pronunciation data and conversion

675 notes use retained CMUdict entries. The main IPA, syllable count, and stress position come from the same selected entry. Other entries may have different syllable counts. The source entries and checksum are retained for verification.

The September 2026 expansion adds 200 listening notes using explicitly American Wiktionary pronunciations or CMUdict readings suited to the word’s use. For Wiktionary notes, the selected transcription, alternative imported readings, and dictionary link are retained for verification. These notes do not use syllable counts from a different dictionary.

CMUdict is a North American English pronunciation dictionary maintained by the CMU Sphinx project. Its ARPAbet phonemes are converted to broad IPA, using English consonant-onset rules to place stress marks. This conversion does not reproduce every detail of an individual speaker’s speech.

For other pages, explicitly American Wiktionary IPA is preferred, followed by CMUdict. An unqualified Wiktionary pronunciation is used only when these are unavailable.

Examples from books

The collection searches 535 books from Project Gutenberg and currently includes 33,811 passages. Two examples appear first, with additional quotations under “More book examples.” Every quotation credits its author and edition, links to the ebook, and highlights the matching word.

We prioritize short, readable passages and preserve the author’s wording. The selection excludes identified historical medical advice and treatment claims, as well as two health-advice sources unsuitable for general vocabulary examples. We leave a book section empty when no suitable passage remains.

Older books can use historical language or a different meaning from the first definition shown. Examples demonstrate written usage; the videos demonstrate pronunciation.

Book selection, verification, and reuse

Each searched ebook is listed as public domain in the United States in Gutenberg’s catalog. Up to five passages per word are retained. Automated spelling matches are ranked for readability and variety across books; matching a word does not establish its dictionary sense. Explicit editorial priorities improve selected entries.

Selection filters out recognizable introductions, contents, editorial notes, and unsuitable passages. The editorial pass withholds 654 previously selected passages; their original text and provenance are retained separately for review.

Original spelling is retained. Whitespace and plain-text emphasis markers are normalized; ellipses identify shortened passages retained from the earlier collection. Source checksums and passage locations allow verification against the downloaded edition. Ebook release dates are not treated as original publication dates.

Modern names and specialist terms may remain uncovered. The collection contains book examples, not news excerpts.

Browse the 535 searched editions

Guides, quizzes, and worksheets

All 906 listening notes can be found through the 21 guides. The lesson lists cover 347 distinct words; “More words in this topic” links to additional notes and videos. Some words appear in more than one lesson so learners can compare different sound patterns. There are 108 guide-specific review questions, and every guide has a printable worksheet.

The six focused lessons cover ch sounds, silent b, p, and l, word-family stress, scientific plurals, menu words, and medical endings. Each draws on twelve existing listening notes and has eight original review questions. Quiz questions can be answered without first watching a video or reading a listening note. Answers explain the pronunciation, with dictionary citations afterward and links to relevant APG videos. Questions about alternative pronunciations identify the variation being tested. The other fifteen guides keep their four-question quizzes.

APG practice sentences, listening notes, and exercises are offered under CC BY-SA 4.0. Credit American Pronunciation Guide and retain dictionary attributions. Quoted passages and videos keep their own source terms.

Related words and search

Comparison links connect useful pairs, such as “root” and “route,” or “analysis” and “analyses.” Topic links lead to more words in a guide. Search suggestions use the existing APG video catalog.

Sound matching and search suggestions

“Compare ending sounds” links match a CMUdict pronunciation from its last primary-stressed vowel to its ending. They compare sounds, not meanings. Names and alternative pronunciations can differ; retained source entries support these matches.

Search matching ignores capitalization, accents, and punctuation. Spelling suggestions use nearby letter sequences and link to existing pages; you can still search using your original spelling.