Does the definition of a fling about how long it lasted or how serious it was while it lasted?

Does the definition of a fling about how long it lasted or how serious it was while it lasted?
I ask because I'm still confused by the term. If a relationship is casual for a long time... is it still a fling--or is it a "long term understood arrangement"? I've also seen a fling as something only a few months; like you meet a person on vacation and you hang out/fuck while you're there... then you break up before you leave? Or someone you meet in college--but you live in different states, so you have to end it before you graduate?

Can you tell me what you think it means? TIME vs STATUS of RELATIONSHIP?

Is the term "fling" more about time spent (very short time) OR how serious the situation was? For example... could you still call it a fling if you were together for over a year but never became straight up exclusive or planned on marriage/getting engaged? Most people get married after being together for a few years, so if you're together for that amount of time but aren't even engaged yet or feel like you want it to be really serious--is it a fling? Are you both just scared of commitment? Is this bad? See link here... https://www.harpersbazaar.com.au/culture/average-time-couples-together-before-marriage-13839
How long it lasted!
How serious it was!
BOTH!
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Does the definition of a fling about how long it lasted or how serious it was while it lasted?
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