Purposefully; with intention; deliberately.(phrase)
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Use "on purpose" in a sentence
"When she was done, she bowed again and accidentally on purpose knocked her butt into the godfather, laughing as he dropped, unresisting, to the mat."
""I came on purpose to find you, Jane Eyre," said she; "I want you in my room; and as Helen Burns is with you, she may come too.""
""Why, there's that old bombazin cloak, that you keep on purpose to put over me when I take my afternoon's nap; you might as well give her that, -- she needs clothes.""