what is investment, this is a placement of Capital with the expectations of making profit, well therr in no way trading is this right,
Definition always come up with another meaning to what some persons believe something to be, just like how you see trading as a non kind of investment thing while the definition you just render says that since profit comes at the end is considered as an investment and in trading profits and loss do normally come to some persons who have spent all their time on it, so if the definition had mentioned that anything that can give profits and also take it back is not an investment then trading would have been off from it, actually I'm only trying to make a comprehensive knowledge about your definition in non or in relation with trading.
we have diverse definitions of investment, you can even derived your own definitions of investment provided that has fact and its not a fiction people will also agree with your theory, it's what you believe on, will be your own definitions of investment, for me anything that you are doing and it yield a profit, it's obvious that thing is a trading from my perspective, so I know that trading is all about what you believe on and what you agree on provided that it yield a profit.