What is the source and real meaning of "provisional living " concept and is there an equivalent term?
The English Analytical Psychologist H. G. Baynes first described the provisional life in a chapter of his book "Analytical Psychology and the English Mind". For a good comprehensive description see http://web.archive.org/web/20150403145822/http://jungiancenter.org/essay/jung-provisional-life


  The Provisional Life. The dictionary defines “provisional” as “for the time being; temporary; conditional.” Something
  “provisional” is not lasting. It depends—on conditions, situations,
  people doing specific things. It is uncertain, more or less up in the
  air. Given a particular set of circumstances, a committee makes a
  “provisional” recommendation, in the understanding that things could
  change. A man undertakes a course of action, provided certain
  conditions are met. The essence of the word is transience.
              In Jungian psychology the concept of “provisional life” embodies the transient nature of “provisional.” The English Jungian
  analyst H.G. Baynes coined the term “provisional life,” and regarded
  it as a form of neurosis, for its resistance to living responsibly in
  temporal reality. The Jungian analyst, James Hollis, described the
  “provisional life” as an “…assemblage of behaviors, attitudes and
  reflexive strategies [that] constitutes our ‘false self,’…” Jung
  himself described the provisional life as “… the modern European
  disease of the merely imaginary life,…” Daryl Sharp provides a
  succinct definition in his C.G. Jung Lexicon: “A term used to describe
  an attitude toward life that is more or less imaginary, not rooted in
  the here and now, commonly associated with puer psychology.”