In`du*ra"tion (?), n. [Cf. F. induration, L. induratio hardness of heart.]
1.
The act of hardening, or the process of growing hard.
2.
State of being indurated, or of having become hard.
3.
Hardness of character, manner, sensibility, etc.; obduracy; stiffness; want of pliancy or feeling.
A certain induration of character had arisen from long habits of business.
Coleridge.
© Webster 1913.