One of the mysteries of the English language finally explained.
The action of making or becoming obdurate, hardened in sin, or insensible to moral influence; the fact or condition of being obdurate; hard-heartedness, stubborn impenitence.
Late Middle English; earliest use found in Vices and Virtues. From post-classical Latin obduration-, obduratio hardening of the heart, physical hardening from classical Latin obdūrāt-, past participial stem of obdūrāre + -iō. Compare Middle French, French obduration, Catalan obduració.
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