Final answer:
The term 'umbrella term' best defines all-encompassing or inclusive expressions, covering a broad category of items or concepts under a single phrase. It simplifies complex ideas for better understanding but may also lead to vagueness.
Step-by-step explanation:
The term that best defines all-encompassing or inclusive expressions is umbrella term. An umbrella term is a word or phrase that covers a wide range of concepts or items that all fall under a single common category. These terms are often used to encapsulate complex ideas or groups in a succinct manner, making them easier to discuss and understand.
For example, the word 'art' can be considered an umbrella term, as it encompasses various forms such as painting, sculpture, music, and dance, despite each form having its own unique characteristics and mediums.
Note that every term has generational, cultural, and geographical specificities, and how these terms are understood and used can vary widely. Umbrella terms are not without their limitations, as they can sometimes be overly broad or vague, which may lead to misunderstandings or misinterpretations. However, they are useful in providing a general sense of what is being discussed.