(colloquial) an expert; a master; a guru or enthusiast who is highly skilled or knowledgeable in a specific field. Influenced by the Japanese word "tatsujin".

(literary) an open-minded person who understands life; an optimist who takes things philosophically

(literary) to help others to attain the same level of success or understanding as oneself

(literary) a person of high rank or social standing; an influential official

to enlarge or broaden one's knowledge and mental outlook