ELI5: Explain Like I'm 5

Extension (semantics)

An extension in the semantics of a language refers to the meaning of a word or a sentence in a certain context. It is like when you try to understand what someone is saying to you based on the situation you are in.

For example, the word "bank" could mean a place where you keep your money, or the side of a river where you can walk. This is because the meaning of the word depends on the context in which you use it. If you are talking about your money, then "bank" means a place where you keep your money. If you are talking about going for a walk, then "bank" means the side of a river where you can walk.

Similarly, the extension of a sentence also depends on the context. For instance, the sentence "I'm going to the bank" could mean that the person is going to deposit money, withdraw money or just go for a walk by the river.

In summary, the extension of language refers to the meaning of words or sentences based on the situation in which they are used. It is like a puzzle that you need to figure out by using your comprehension skills to understand the context.