Endurance is the power to withstand something challenging. If you decide to run a marathon, you will need lots of endurance to run over 26 miles.

The noun endurance contains endure, which means "to suffer or undergo" and the suffix -ance means "the state of." It can be used to describe the physical strength to keep going, as in a marathon or giving birth, but it can also be used when discussing an exhausting mental situation or stressful time — the endurance to bounce back from heartbreak, perhaps.

Definitions of endurance
  1. noun
    a state of surviving; remaining alive
    synonyms: survival
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    a means of surviving
    type of:
    aliveness, animation, life, living
    the condition of living or the state of being alive
  2. noun
    the power to withstand hardship or stress
    “the marathon tests a runner's endurance
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    patient endurance especially of pain or distress
    stamina, staying power, toughness
    enduring strength and energy
    long-sufferance, long-suffering
    patient endurance of pain or unhappiness
    the power or capacity of an organism to tolerate unfavorable environmental conditions
    staying power
    tolerance for alcohol
    type of:
    the property of being physically or mentally strong
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