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From Medieval Latin syntērēsis (in Thomas Aquinas), from Ancient Greek συντήρησις ‎(suntḗrēsis, careful watching), from συντηρεῖν ‎(suntēreîn, to keep guard).



synteresis ‎(uncountable)

  1. (theology, historical) An aspect of one's conscience by which one can judge wrong from right and decide on what makes good conduct (as distinguished from syneidesis).
    • 1621, Robert Burton, The Anatomy of Melancholy, Bk.I, New York, 2001, p.166:
      Synteresis, or the purer part of the conscience, is an innate habit, and doth signify “a conservation of the knowledge of the law of God and Nature, to know good or evil”.