Meaning

noun (psychology) a person who tends to shrink from social contacts and to become preoccupied with their own thoughts

verb fold inwards

verb turn inside

originFrom New Latin intrōvertere, from intro- (“within”) and vertere (“to turn”). Popularized as a psychological term by the German works of Carl Jung. By surface analysis, intro- + -vert.

Etymology from Wiktionary, CC BY-SA 3.0