When used as an honorary title, maharishi can be used by anyone. Probably the most famous person to use this title in the West was Maharishi Mahesh Yogi, who pioneered transcendental meditation and offered spiritual advice to many celebrities. He almost always recommended yoga practice as a means of accelerating spiritual growth.
Maharishi is also used to mean “poet,” “spiritual leader,” “holy person" or “wise man." Additionally, the word is used to describe the seers that are mentioned in Vedic texts, or the seven rishis that are referred to in the "Rig Veda."