on purpose

[ostap77]

I have always believed that we say "on purpose" not "in purpose".

Do we ever say "in purpose"?

[Mehrgan]

I have always believed that we say "on purpose" not "in purpose".

Do we ever say "in purpose"?

I don't think "in purpose" has any sense at all. "on purpose", meaning "intentionally" is the right one.


*not a teacher*

[philadelphia]

Not a teacher

No, it isn't correct. For instance, you could say either "he did it on purpose" or "he purposely did it".

[Pedroski]

You can use 'in purpose', but not as a substitute for 'on purpose'

These studies are commendable in purpose,
Jimmy Wales set out to build a massive online encyclopedia ambitious in purpose and unique in design
'The secret of success is constancy of purpose.' - Benjamin Disraeli. Here you could use 'in' instead of 'of'.

Your purpose is your aim or intention. As the object of a preposition it becomes part of an adverbial.