Editorial Standards
Broad enough to search. Focused enough to learn.
LexUp contains two separate English word collections, built for two different purposes.
Two collections, two responsibilities
The searchable dictionary includes more than 500,000 entries and allows learners to investigate English far beyond the words included in their current lessons.
The learning collection contains approximately 15,000 words selected for practical vocabulary development across CEFR levels A1 to C2. It focuses on useful general, academic and frequently encountered English rather than trying to teach every searchable dictionary entry.
500,000+ searchable entries
English is much larger than any realistic learning syllabus.
LexUp’s lookup dictionary brings together large-scale lexical data that has been normalized and structured for search. It includes common words, inflected forms, less frequent vocabulary and specialist terms that learners may encounter while reading, studying or working.
Being available in the dictionary does not automatically mean that a word is prioritized for learning.
Approximately 15,000 learning words
The learning collection is intentionally smaller.
These words are selected because they are useful enough to teach, practise and review. The collection includes everyday vocabulary, academic English and higher-level words commonly encountered in books, media, education and professional communication.
For example, a learner may be able to search for a highly technical medical or legal term in the larger dictionary, while LexUp’s learning system prioritizes words with broader value for communication and comprehension.
Who reviews the learning collection
LexUp’s English learning content is reviewed with input from English-language educators.
The editorial review is coordinated by Olgun Aldemir, LexUp’s founder and a former English teacher with teaching experience in Türkiye and Canada.
The educator review group includes Fatma Aldemir, a graduate of the English Language Teaching program at Boğaziçi University, one of Türkiye’s leading universities.
Additional reviewers and contributors include English-language educators who are also graduates of Boğaziçi University. Some contributors have advanced academic qualifications and research experience in education and related fields.
What educator review means in practice
The review process is not limited to checking spelling or grammar.
Reviewers consider whether each part of a learning entry is genuinely useful to an English learner.
CEFR level
Reviewers consider whether the suggested CEFR level reflects how difficult and useful the word is for learning purposes.
For example, a word may appear frequently in a specialist field but still be inappropriate for an early-level learner. Conversely, a word with several meanings may require a higher learning level even when one of its meanings appears simple.
Definitions
Definitions are checked for accuracy, clarity and unnecessary complexity.
For example, a definition should not require the learner to understand several words that are more difficult than the word being defined. Where possible, LexUp prefers a clear explanation over dictionary-style jargon.
Example sentences
Examples are reviewed to make sure they demonstrate natural meaning and usage.
A useful example should show how a word behaves in a real sentence, including its common grammar, tone or context. It should not merely repeat the definition in a different form.
Explanations and Deep Dives
Additional explanations are included when they help learners understand something that a short definition cannot fully show.
This may include:
- the difference between commonly confused words;
- formal and informal usage;
- typical collocations;
- common grammatical patterns;
- differences between literal and figurative meanings;
- situations in which a technically correct word would sound unnatural.
For example, a Deep Dive may explain why two words have similar dictionary definitions but are not normally interchangeable in everyday English.
Learning priority
Not every valid English word deserves equal attention.
Reviewers consider whether a word is useful enough to be included in the learning collection or whether it is better kept only in the searchable dictionary. Extremely obscure, outdated or narrowly specialist terms are generally given a lower learning priority.
How technology is used
LexUp uses large-scale language data and automated tools to organize entries, identify inconsistencies and support the production of learning material.
Automation helps with scale, but it is not treated as proof that an entry is correct.
Learning content may be checked, edited or removed when educator review, user reports or new language evidence shows that an entry can be improved. The English definition and usage examples remain the primary learning reference.
Translation policy
LexUp teaches English vocabulary.
Preferred-language translations are provided to help learners understand English words, definitions and examples. They are supporting explanations rather than separate target-language courses.
Automated translations can occasionally miss context, tone or secondary meanings. For that reason, learners should treat the original English entry as the primary reference and report any translation that appears misleading.
Corrections and updates
Language data evolves, usage changes and mistakes can happen.
Reports about definitions, pronunciation, examples, translations, explanations or CEFR labels are reviewed before a correction is incorporated.
To report an issue, email aldemir@lexupapp.com and include:
- the word;
- the part of the entry that appears incorrect;
- a brief explanation or suggested correction;
- a source, where relevant.
Specific reports are easier to investigate than general feedback and help us improve the entry more quickly.
Last reviewed: July 12, 2026