1. basic or elementary; involving only the most essential aspects
2. incompletely developed; in an early stage of development

Examples

• She has only a rudimentary understanding of Spanish.
• The cabin had rudimentary plumbing and no electricity.
• His rudimentary knowledge of computers made the task difficult.
• The bird’s wings were still rudimentary and couldn’t support flight.
• They built a rudimentary shelter from branches and leaves.
• The software provides rudimentary editing features.
• Students need rudimentary math skills before taking algebra.