Core Learning Words
A combination of new words and words you have not mastered yet. The system selects up to 20 in total.
A focused system for building your English vocabulary
Learn 20 Words.
One Session at a Time.
Learn new words from your current and lower English levels, revisit words you have not mastered, and review learned vocabulary at the right time.
The ENG20W session
20 Core Learning Words + Up to 10 Due Reviews
Each session is built around up to 20 core learning words, with up to 10 additional words that are due for review.
Due Reviews
Review up to 10 mastered words when their scheduled review date arrives.
Up to 30 Words
A session can include up to 20 core learning words plus up to 10 due reviews, depending on the words available.
Step 1 · Discover
New Words from Your Level and Lower Levels
New vocabulary is selected according to your learning level, while also bringing in useful words from levels you have already passed.
Your current level comes first. The selection aims for approximately two-thirds of new words from your current level and one-third from lower levels.
Available words from lower levels are distributed across those levels. If there are not enough words in one group, the system fills the remaining places from other available levels.
For example, a B1 learner can receive new words from B1, A2 and A1. Words from higher levels are not included.
Step 2 · Practise Again
Unmastered Words Return in Your Learning Sessions
Words you find difficult are not left behind. They return as part of your core learning words until you are ready to master them.
Revisit Difficult Words
When you choose “I Don't Know”, the word is marked as unmastered and becomes eligible for future learning sessions.
Prioritise Older Words
The system gives priority to words that have remained unmastered for longer.
Move Towards Mastery
When you know an unmastered word, it enters the spaced repetition review cycle.
Step 3 · Remember
Review Mastered Words at Scheduled Intervals
After you mark a word as known, ENG20W schedules it for review. Each successful review moves the word to its next interval.
After 5 Days
Your first scheduled review after mastering a new or previously unmastered word.
After 10 More Days
After completing the first review successfully, the next review is scheduled 10 days later.
After One Month
After the second review, the next review is scheduled one month later. The cycle then starts again with a 5-day interval.
What if you do not remember a word during review? It returns to your unmastered words and can appear again in future core learning sessions.
Learning support
Understand Every Word in Context
Each word includes learning support to help you understand it, hear it and use it in practical situations.
Pronunciation
Listen to word pronunciation in British and American English.
Clear Meanings
Understand each word through its meaning and part of speech.
Practical Examples
See example sentences that show how words are used in context.
Helpful Images
Use relevant images to support understanding and recall.
CEFR Levels
Learn through five levels, from Beginner (A1) to Advanced (C1).
Track Your Progress
Follow your learning progress and see how your vocabulary grows.
Frequently asked questions
About ENG20W English Vocabulary Learning
Find out how learning sessions, vocabulary selection and spaced repetition work.
What is ENG20W?
ENG20W is an English vocabulary learning platform that helps learners build their vocabulary through focused learning sessions, repeated practice and spaced repetition.
How many words are included in each session?
A session can include up to 20 core learning words and up to 10 additional words due for review, for a maximum of 30 words depending on availability.
How does ENG20W select new vocabulary?
New words are selected from your current CEFR level and lower levels only. The selection aims for approximately two-thirds from your current level and one-third from lower levels.
What happens to words I have not mastered?
Words marked as unmastered return in future regular learning sessions. Older unmastered words are prioritised.
How does spaced repetition work?
The first review is after 5 days. After a successful first review, the next is 10 days later. After a successful second review, the next is one month later. The cycle then restarts with a 5-day interval.
Which English levels does ENG20W support?
ENG20W supports five CEFR levels: A1 Beginner, A2 Elementary, B1 Intermediate, B2 Upper Intermediate and C1 Advanced.
Start building your vocabulary
Make Every Learning Session Count
Learn new words, revisit the ones you find difficult, and review mastered vocabulary over time — one session at a time.
Project ownership
ENG20W is a project by Ibtikary
Ibtikary develops practical digital products, platforms and online projects. ENG20W is its English vocabulary learning project, built around focused learning sessions and structured word review.
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For information about Ibtikary and its digital projects, visit the
official Ibtikary website using the link above.