Quote from MAESTRO:
No they are not! There is not a one formal definition of a trend in any of your books. If you had one then you'd post it here rather than hide behind your "publicly available views".
Cheers,
MAESTRO
I don't get all the fuss. Read about the original turtle traders and other trend-followers. There are multiple trend-following systems and therefore definitions of trends. They use different break-out/ATR levels or other indicators to determine trend. But the basic idea is buy/sell after a large move occurs and ride the trend until a substantial reversal occurs. How "large" or "substantial" depends on the system. And some may even by dynamic--perhaps they do walk-forward optimizations and change ATR or MA values as time goes on. But the basic concept isn't difficult.
While you're at it, you might as well try to get a single, universally-agreed on definition for mean-reversion trading, cycle trading, chart pattern trading, algo trading, Gann trading, Elliot Wave trading, etc. Good luck.