[tx_eggman]

Do you know what "theory" means in this context?

I'm thinkin' that, in this context

theory = theory

Or, in order for me to fully understand, must I first know what the meaning of "is" is?

[Dimensio]

I'm thinkin' that, in this context

theory = theory

And what, exactly, do you think is the meaning of that word? What do you think that the use of the word "theory" implies?

Or, in order for me to fully understand, must I first know what the meaning of "is" is?

No, but it is helpful to understand what "theory" means in the context of science, as too many people seem to think that it implies a status of little more than a guess.