Attribution

Sources

Lessons 0031 onward combine simple definitions and usage examples from Simple English Wiktionary, Chinese definitions from ECDICT, examples and sense data from WordNet 3.0, and syllable guidance from Wiktionary, Pyphen patterns, and CMUdict. Automatically written fallback examples are used when an open dictionary has no suitable example.

Open data

• Simple English Wiktionary, extracted with Kaikki / Wiktextract. Wiktionary text is available under CC BY-SA 4.0 and the GNU Free Documentation License.
• ECDICT, MIT License.
• Princeton WordNet 3.0, Princeton WordNet License.
• CMUdict, Carnegie Mellon University license.
• Pyphen and the bundled US English hyphenation patterns, used at build time.

Full notices included with this website are available in THIRD_PARTY_NOTICES.md. License files: ECDICT, WordNet, CMUdict, hyphenation patterns, and Simple Wiktionary notice.