What is meant by the term 'machine word' in the context of computer architectures?

The term "machine word" in computer architectures refers to a fixed length of data that the processor can handle at one time. It is usually the size of the processor register or data bus. For example, in a 32-bit architecture, a machine word is 32 bits, and in a 64-bit architecture, it is 64 bits. The machine word determines the maximum size of numbers that the processor can efficiently process and also affects memory addressing.