1.NounA person or organization with some sort of responsibility for another person or organization, especially where the responsibility has a religious, legal, or financial aspect.
"He was my sponsor when I applied to join the club.; They were my sponsors for immigration.; My narcotics anonymous sponsor became my best friend when I finally was able to do something about my meth problem."
2.NounA senior member of a twelve step or similar program chosen to guide an initiate and form a partnership with them.
"My narcotics anonymous sponsor became my best friend when I finally was able to do something about my meth problem."
3.NounA person or organization that pays all or part of the cost of an event, publication, media program, etc., usually in exchange for advertising.