General meaning of change:
* mudança - This is the most common and general word for change.
Specific meanings of change:
* alterar - to change (something)
* modificar - to modify, to alter
* transformar - to transform, to change completely
* trocar - to exchange, to swap
* converter - to convert, to change into something else
Here are some examples:
* A mudança é inevitável. (Change is inevitable.)
* Ela quer alterar o seu estilo. (She wants to change her style.)
* O tempo pode modificar as pessoas. (Time can change people.)
* A metamorfose transforma a lagarta em borboleta. (Metamorphosis transforms the caterpillar into a butterfly.)
* Quero trocar este livro por outro. (I want to exchange this book for another one.)
* O conversor digital converte sinais analógicos em digitais. (The digital converter converts analog signals into digital ones.)
The best translation for "change" will depend on the specific context and the intended meaning.