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839 curated words
B1, B2 and C1 core vocabulary plus 147 academic and exam-topic words (biodiversity, curriculum, infrastructure). Every entry is hand-written — no scraped or auto-generated definitions.
Free · no account · works offline
Master the vocabulary the Duolingo English Test actually tests.
Glosseme is a browser-based DET vocabulary trainer with 839 hand-written words — each one with a plain-English definition, an example sentence and synonyms. Four quiz modes, mastery tracking, and progress that saves in your browser.
839curated words
4CEFR levels
4quiz modes
0sign-ups
B2adjectiveWord → meaning
aesthetic
Which of these best explains it?
1easily broken or easily harmed
2not certain or not final
3to pay for loss or to balance a problem
4concerned with beauty or artistic taste
Built around how vocabulary is actually tested
The DET asks you to read, complete and produce text under time pressure. Recognising a word is only half the job — so Glosseme makes you meet each word several ways.
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Four practice modes
Word to meaning, meaning to word, fill the blank from a real example sentence, and type-the-word recall. Or mix all four in one round.
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Adaptive ordering
Each round prioritises words you have not seen and words you have missed, so the same easy words do not keep eating your study time.
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Mastery, not just streaks
A word counts as mastered after 3 correct answers in a row. Progress bars show how far each level has come, per level.
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Saves as you go
Every answer is written to this browser's local storage the moment you give it. Nothing leaves your device, and you can close the tab mid-round.
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Pronunciation built in
Hear any word with your device's speech voice — useful for the listening and speaking sections that make up half of the DET.
The word library
839 unique entries, no duplicates. Each word carries a level, part of speech, definition, example sentence and synonym hints — searchable and filterable in the app.
| Level | Words | Sample |
|---|---|---|
| B1 — core everyday English | 222 | achieve, available, challenge, environment, suggest |
| B2 — upper intermediate | 189 | ambiguous, consensus, feasible, mitigate, viable |
| C1 — advanced | 281 | corroborate, ephemeral, meticulous, pervasive, tacit |
| Academic — exam topics | 147 | biodiversity, curriculum, infrastructure, subsidy, urbanization |
How a session works
Pick a level and mode
Start with B1 if you are new, Academic if your exam date is close. Choose a round of 10, 20, 40 or endless.
Answer, don't guess
Every question shows the full entry — definition, example, synonyms — after you answer, so a miss still teaches you the word.
Review what you missed
The round summary lists your missed words, and one tap starts a follow-up round with exactly those.
Practice modes
Different modes train different directions of knowledge — recall, recognition and production.
| Mode | What you do | What it trains |
|---|---|---|
| Word → meaning | See a word, choose the right definition from four. | Recognition |
| Meaning → word | See a definition, choose the word. | Active retrieval |
| Fill the blank | Complete the word's example sentence. | Use in context |
| Type the word | Produce the word from its meaning, from memory. | Spelling and production |
Questions
Is Glosseme free?
Yes. There is no account, no paywall and no advertising. The whole trainer is a static site — it loads once and runs in your browser.
Is it affiliated with Duolingo?
No. Glosseme is an independent study tool for people preparing for the Duolingo English Test. It is not endorsed by, associated with or sponsored by Duolingo.
Does it work offline?
After the first load, all 839 words and the quiz logic are in your browser, so practice continues without a connection. Progress is stored locally too.
Where is my progress saved?
In your browser's local storage, under two keys: one for per-word statistics and one for lifetime totals and practice days. It never leaves your device unless you export it — use Export progress on the Progress tab to move it to another browser or device.
What levels does it cover?
839 words across B1, B2 and C1, plus 147 academic and exam-topic words. The DET is designed to measure English from roughly A2 to C1+, so this range targets the band most candidates are scored in.
How do I know which words to study first?
Let the app decide: each round serves unseen and previously missed words first. Use the Progress tab to see mastery by level, and the "practise weak words" button to focus on what is not sticking.
Are the definitions written by a person?
Yes — each entry has a hand-written definition, an example sentence and synonym hints, checked for accuracy rather than generated on the fly.
Ten minutes a day beats a weekend of cramming
Start with 10 words at your level. The streak counter does the rest.
Open the trainer