Transhuman wrote:
Does it mean going out on a date, or simply having a relationship without dating? I heard that it can mean both. But when and where is the second definition more appropriate?
Is the definition the same, for, say, high school students and grown up adults?
In my experience:
"Do you want to go out with me?" = "Do you want to be my boyfriend/girlfriend?"
"Shall we go out to lunch/have a coffee?" = exactly what it says, no romantic interest implied.
"X is going out with Y" = X and Y are boyfriend and girlfriend (going on dates is implied here, as most couples do).
Dating is something you do once you are in a relationship. If you're having lunch/coffee together to get to know each other outside a relationship, then it is platonic.