Relating to involution.
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in·vo·lu·tion·al .in-və-'lüsh-nəl, -ən-əl adj
1) of or relating to involutional melancholia <\involutional depression>
2) of or relating to the climacterium and its associated bodily and psychic changes <the \involutional time of life>
involutional n one who is affected with involutional melancholia
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in·vo·lu·tion·al (in″vo-looґshən-əl) pertaining to, due to, or occurring in involution.Medical dictionary. 2011.