There's linguistic meaning, and then there's meaning in the sense of purpose. I want to talk about a kind of non-linguistic, non-purposeful meaning. Let me give a few examples.
You see that the lower five feet of a fir tree has been defoliated, with lush green leaves above. What does this mean?
Answer: It means the fir tree has been eaten by deer.
You notice your car is slow to get up to speed, and there's an unpleasant sound as it does so. What does that mean?
Answer: It could mean the car has bad spark plug timing, or maybe it means there's something wrong with the transmission. Which it means, depends on which is actually the case.
You are in the middle of a lake in a canoe and you can see there's a thunderstorm approaching from a distance. What does that mean?
Answer: it means you'd better get to shore, or you might capsize or be struck by lightning.
There was no intentional message passed in these examples, no human-designed symbol. But there was, nonetheless, a meaning. In each of these cases, to ask the meaning of an observation X is to ask, "what information can I usefully infer from X?"
- It is useful to infer that deer were eating the fir trees, merely because it enhances your understanding of your natural surroundings. If you happen to own any fir trees, it could be more concretely useful because you know you need to put up deterrents against deer.
- It is useful to infer that the problem with your car is bad spark plug timing, assuming it actually does, because then you know what to fix. On the other hand, if the problem was the transmission, then it is not useful to infer that the problem is bad spark plug timing. So, which car problem it is useful to infer, and therefore the meaning of the observation, depends not only on the observation itself but also on what is actually the case, apart from the observation.
- It is useful to infer that you need to get to shore. This case is different from the preceding two because the inference is about what the observation implies will happen in the future, as opposed to what events in the past caused the observation.
Let me call this type of meaning, "natural meaning," because it is the meaning of an observation deriving from nature or physics, as opposed to an intentional linguistic message sent by a human.
Note that there are many trivial inferences that could be made from the fir tree observation. For example, we could say that the fir tree is more than five feet high. We could say that the defoliated parts of the fir tree are closer to Thailand than the green parts. But such inferences are not terribly useful; they're either so obvious they don't bear mentioning, or you don't care about them, not even from passing interest. Usefulness may lie on a spectrum, with no clear line demarcating useful inferences from non-useful ones, but when we ask after the meaning we are asking for the most useful few inferences.
Can we understand linguistic meaning as simply a type of natural meaning? If I read a letter, what I can usefully infer from the letter, and the meaning of the letter, are usually the same. It is useful to form the ideas in my mind that the writer of the letter intended to convey, because it grants me insight into the writer's mind, which I must be interested in or I wouldn't be reading the letter.
There may seem to be a difference if the letter contains lies that I can see through. In that case, what I usefully infer from the letter (the natural meaning) may not be the same as the literal meaning. However, we may say that the literal meaning is part of the natural meaning, because it is useful for me to infer what specifically the writer of the letter wanted me to believe, and what he wanted me to believe is the literal meaning. And then also, in addition to that, it is useful for me to infer what is actually the case, seeing past the lies. So the natural meaning contains the literal meaning and also more.
Can we understand linguistic meaning as simply a type of natural meaning?