TOEFL Essential Vocabulary Dataset (AI-Enriched)

🎓 TOEFL Essential Vocabulary Dataset (AI-Enriched)

A meticulously curated, AI-enriched dataset of 1,000 high-frequency academic words essential for the TOEFL iBT, IELTS, and advanced English comprehension.

⚖️ License & Attribution This dataset is completely free and open-source under the MIT License. You can use it in your apps, research, or LLM training pipelines.

Attribution Requirement: If you use this dataset in a public repository, website, or research paper, you must provide a clickable do-follow backlink to https://wordlevel.net as the original source of the data.

🌟 Why This Dataset?

Most open-source vocabulary lists only provide a word and a simple definition. This dataset is engineered for deep linguistic understanding and NLP applications. Each entry includes:

Academic Theme: The specific field (e.g., Biology, Sociology, Geology) where the word frequently appears.

Exact Synonyms: Hand-picked synonyms curated specifically for academic reading comprehension.

Contextual Example: A high-quality, TOEFL-level sentence demonstrating real-world academic usage.

Difficulty Level: Rated from 3 (Intermediate) to 5 (Advanced).

POS & Definitions: Precise Part of Speech tagging and accurate English definitions.

📂 File Formats Included

toefl_essential_vocabulary.json: Full structured data (Best for Web & Mobile Apps).

toefl_essential_vocabulary.csv: Tabular data (Best for Pandas, Data Science, and Kaggle).

toefl_essential_vocabulary.txt: Plain word list (Best for quick array imports).

{  "word": "proliferation",  "pos": "noun",  "difficulty": 5,  "theme": "Biology",  "synonyms": ["multiplication", "expansion"],  "definition_en": "Rapid increase in numbers.",  "example_sentence": "The proliferation of invasive plant species severely threatens the delicate balance of the local ecosystem."}

👉 https://wordlevel.net