I agree that discussions about what something "ought" to be called are sometimes superfluous. However, agreeing on the definitions of terms is rarely superfluous - in fact, it's usually critical to a useful discussion and good decisions. So, I start there:
Tick: Timestamp, Bid, and Ask provided whenever one of the latter 2 changes in live trading; or provided as historical data from live trading. (Or I suppose could be made up to simulate future trading...)
Bar: Timestamp, Open, Close, High, and Low built from the Ticks of whatever the Bar's historical time period is, possibly ending with the most recent live data, Open coming from the last Tick prior to the start of the time period. Also called Candle.
Is this correct? Is there any other useful term to define?
FWIW, I completely agree with your definitions, and that is how I have seen those terms, always.
I also agree that the proper terminology is essential. Especially in complex topics, and automated trading is certainly complex.
