# rudimentary

/ˌɹudəˈmɛntɝi/ (US) · /ɹˌuːdɪmˈɛntəɹi/ (UK) · CEFR C1 · Adjective

Source: https://englishreference.com/word/rudimentary
Updated: 2026-05-08

## Definition

very basic or simple. You use this to describe something that is not fully developed or only covers the most important parts.

For teachers: relating to an immature, undeveloped, or basic form. Often describes skills, knowledge, or biological structures that are in an early stage of evolution or development.

## Examples

- He only has a rudimentary knowledge of French.
- The early settlers built rudimentary shelters using only the branches and mud they found nearby.
- While the species exhibits rudimentary social behaviors, it lacks the complex hierarchical structures observed in more advanced primates.

## Usage notes

- Typically used to describe systems, skills, or physical structures; often carries a slightly negative tone if more complexity is expected.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.