Yea sure!
Here's the idea at least, I'll.. I don't know how to give the math, but you can do that yourself after understanding this.
The idea here is to define a word, any word, in an accurate model of reality, so it has predicting powers, kinda like creating a whole theory around a word. We define a word using physics, and.. all the information we have gathered about it, without actually using the word, like of a "guessing game"
Understanding set- and model theory especially helps, but it's not really necessary when we are talking about apples..
This is a very shitty example, but to get the idea, let's take a simple kinda of a time function, from 0 to 1, what ever time unit you want to use. And during 0 - 1 this "something" outputs 3.846×1026 W.
And now you have a very, very good idea what I am talking about, without using the "word" sun. Now there is no debate what the word "sun" means, just how much energy it produces during that time.
And now we could continue that equation by adding what types of wavelengths it produces and so on, the size, a whole theory around it!
But yea, when you are defining sun, it's not absolute, obviously, because.. times change, that's why it's just "a theory".
Factually, mathematically saying it is not wrong to say Sun doesn't exist, because it will cease to exist, like, this moment in this time and space in reality + 1T years (years as we know it)
Sun is a rather easy one to say using maths, it's such an obvious thing to us, just giving me information to me how much it produces energy, and it's approximate distance from point X, where I am is enough.
I'll give a more of an accurate definition of something when I have more time, that is just the idea of it, the usefulness of equating any object, word in reality is an another thing..
Now you know the idea, could you try to begin to define something easy like, "to run" using this information?
Ode to science!