[magicbeanss]

Treble comes from Old French, while triple comes from Latin. They mean exactly the same thing, and both words started as "triplus" in Latin. "Treble" is more commonly used in British English. In American English the word is used only in musical contexts.

[twic]

It may be more commonly used in British than in American, but even in British, i think it's less commonly used than 'triple'. For me, a native British speaker, the only things that are ever treble are twenties, whiskies, and clefs.

[toyg]

You must be upper-class. The only treble that working-class Brits know, is when you win the Premier League and two other cups in the same season.

[CalRobert]

"It may be more commonly used in British than in American"

What is this American you speak of? Perhaps it's the unique dialect of Spanish spoken in southern California? Or the Canadian French spoken in bits of northeastern North America? Or the dialect of English spoken in Belize?

[sandworm101]

By my mind, 'treble' is more associated with amount (3 x some value) while triple means three objects (3 of something). I don't know about dictionaries, but that's how I understand and use the words.

[arcticfox]

And also fish hooks in American English (treble hooks). The demographics of people knowing the definition of treble would be an interesting slice!

[mikecb]

And legal, but that's the common law coming through.

[mason55]

It's frequently used in law contexts as well in American English ("treble damages")