What is the meaning of "natural"?

well, if you look at it in another sense the word "nature" can mean what is supposed to be observed as opposed to what is. therefore "natural" can mean things as they should be, or when least exposed to by outside variables

I enjoy your wit, good sir or madam.

what is determined as 'natural' or 'unnatural' is based entirely on ones perception of life, as in, what one has experienced, or what one has been taught.

as of thus, nothing is truly 'natural' or 'unnatural', as this are merely describing words, as you have, more or less, realized and stated in your question.

hum... it seems I don't entirely understand your question. I apologize, and hope that my attempt at least offers some insight to finding your answer.

I understand what you mean with the example, " 'what is a pig' 'a pig is a pig' " but I must say it isn't a very good example.

to be sure, I haven't encountered situations in which a question was asked, to which someone replied 'it's natural.'

So, To clarify, saying that something is 'natural' or 'unnatural' isn't a valid response. And this is why no one uses it. At least, not that I've seen or heard.

I think NW was headed in the right direction. The natural version is that form which is unaltered, or unadulterated. To say that a pig is a natural pig is to say that it is unaltered; unmanipulated; unaffected. Of course, this is a relative term, and one which depends heavily on perspective, sort of like the word far. I might say China is far, but a Chinese person would disagree. Canada is far from me as well, though not so far as China. Homosexuality is unnatural if we view Christian sexual morality as our base, unadulterated state, and see homosexuality as something Satan pushes people toward. But to someone who views whatever is happening in the animal kingdom as what is natural, when they learn of primates which engage in homosexuality, they conclude that it is natural. In terms of relative perspective, one with regular exposure to S&M might see homosexuality as very natural, compared to fetishizing pain.

In my opinion, by the way, arguing that any sort of Christian morality is natural is completely backward. The natural man is precisely that lesser part of us that we ought to be working to rise above as Christians. Morality is supposed to be unnatural. It is the very thing that sets us apart from the natural world. In the garden, natural is great. In human behavior, I prefer civil and moral.

I know...it sounds like it could mean just about anything. I think 'natural' basically describes an inherent characteristic that is indicative of that specific thing...or distinction.