Etymology
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resiliency (n.)

1660s, "resilience, tendency to rebound;" see resilience + abstract noun suffix -cy. The meaning "power of recovery" is by 1857.

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temper (n.)

late 14c., "due proportion of elements or qualities," from temper (v.). The sense of "characteristic state of mind, inclination, disposition" is first recorded 1590s; that of "calm state of mind, tranquility" in c. 1600; and that of "angry state of mind" (for bad temper) in 1828. Meaning "degree of hardness and resiliency in steel" is from late 15c.

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