The two definitions i provided is thought be widely accepted and sufficient and for that reason and i do not believe EU needs to define what "Enters" means.
Have you researched what "Place on the Market" officially means? Have you read The Blue Guide (an official EU document, dealing with CE marking in general)?
I agree with you that the EU does not need to define what "enters" mean. It's a term you chose to use, and that's the only reason I addressed it.
Everyone is of course entitled to believe whatever they want.