ELI5: Explain Like I'm 5

Semantic equivalence

Semantic equivalence means that two things have the same meaning. Let's say you have a red apple and a green apple. They look different on the outside, but they're both apples and they taste the same. So even though they look different, they have the same meaning.

Now let's talk about something else. Have you ever heard two people say the same thing, but use different words? For example, someone might say "I am going to take a nap" and someone else might say "I'm going to go rest for a while." Even though they said it in different ways, they both mean the same thing—they're going to take a break and rest. That's called semantic equivalence too!

So basically, if two things have the same meaning, no matter if they look different or are said in different words, then we can call them semantically equivalent.