intentionally *
deliberately **
designedly
on purpose
purposely
advisedly
by choice
by design

I stop'd here one day on purpose to see them.

I know you left them on purpose just to have a reason to call.

I don't know if the guy hit me on purpose.

Now she wants you to believe I killed him on purpose.

I don't care whether you can hit anything on purpose, or not.

Is this the sort of thing we can do on purpose?

Someone would have to be doing it on purpose, then.

I had come late on purpose, but this was not good.

It almost seems like she held back certain things on purpose.

I'm not trying to make out you did it on purpose or anything.