1. A physical or organizational arrangement that does not follow a regular, uniform, or expected pattern
The building's irregular structure made it difficult to design the interior layout.
A estrutura irregular do edifício dificultou o projeto do layout interior.
2. In grammar, a word form that does not follow standard conjugation or declension patterns
The verb 'go' is an irregular structure in English because its past tense is 'went'.
O verbo 'go' é uma estrutura irregular em inglês porque seu passado é 'went'.
3. In geology or architecture, a formation or construction lacking symmetry or consistent geometric form
The rock formation displayed an irregular structure with jagged edges.
A formação rochosa exibia uma estrutura irregular com bordas irregulares.