/ ˈɪntrəvɜːt; NAmE -vɜːrt/ noun
a quiet person who is more interested in their own thoughts and feelings than in spending time with other people
OPP extrovert
► intro·ver·sion / ˌɪntrəˈvɜːʃn; NAmE -ˈvɜːrʒn/ noun [ U ]
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WORD ORIGIN
mid 17th cent. (as a verb in the general sense turn one's thoughts inwards (in spiritual contemplation) ): from modern Latin introvertere , from intro- to the inside + vertere to turn. Its use as a term in psychology dates from the early 20th cent.