I'ld dare say that "meaning" in the sense of "purpose" is a human invention. A concept that only exists in our brain. Perhaps even some sort of survival mechanism.
Well... you would then dare to jump into the ocean of absurdity without any justification for doing that either

. It's a very brave, but not a very sensible thing to do.
I would argue that the only way that an intelligent process like the brain could function IS by contextualizing purpose. By purpose, we generally mean the reason that something is done or exists in context of observable reality.
For example, if we look at some object, like a hat, we don't look at it nominally. Our brain contextualizes it with some "end goal" in mind. The hat is something that you place on your head, to keep you warm, or protect you from the sun, or to express your uniqueness and dominance in some societal context. Whatever it may be, our brain contextualizes the entirety of a "brain map" of what the hat is in respect to its purpose. It's not arbitrary invention. It's how our brain works as a process.
In fact, in describing the above, I actually contextualizing the purpose and meaning of the brain as a process. Thus it can't be something that we "invented", because we didn't invent our brain function. We merely recognize it conceptually, and label it (hence we get self-awareness).
And the above only touches the brain part of the argument. We didn't even get to the concept of coherence of how our brain functions relate to reality, and we are already neck-deep in absurdity. Let's keep going though.
What you seem to be implying is that at some point of time our brains did not have that function, and then we invented, or let's say it was some evolutionary selection that happened to select brains that "invented" that function to survive better. Even in that case, you would have to admit that either:
a) Such concepts would allow brains to better map reality
or
b) That such concept is merely a delusion
You can't claim A and B at the at the same time, and here's why.
If B is the case, then it would mean that our functional map of the world is not grounded in reality, and it's merely a delusion. If you claim B, then you essentially giving up reason, logic, and scientific enterprise all together, because the implication is that any purpose-centric statement (in context of meaning) would be a delusion of the brain.
There is no actual purpose in reality. We are just correlating the consitent absurdity and pretending that it works.
I don't know about you, but it seem doesn't like that's what we do.
If you claim that A is the case, then it means that you are not merely projecting meaning on otherwise absurd reality, but that reality inherently has some meaning and purpose and our brain recognizes it, and thus there is a sufficient grounds to build reasoning, logic, and scientific enterprise on.
I'd invite you to
really think about about the implications of what you are saying beyond writing a couple of sentences that seemingly validate your view.