Strength is the property of being physically strong (you can do, say, 100 push-ups) or mentally strong (you can calculate percentages in your head while people are shouting at you).

Strength has several shades of meaning. The strength of something can be the measure of how much force or pressure it can withstand over time (like a flood wall). Or its potency (like a pesticide). Or its intensity level (like a radio signal). Its fighting capabilities (like an army). Or its specialty: A chameleon's strength is actually in its ability to blend in with its surroundings.

Definitions of strength
  1. noun
    the property of being physically or mentally strong
    “fatigue sapped his strength
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    the property of lacking physical or mental strength; liability to failure under pressure or stress or strain
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    good part
    a place of especial strength
    brawn, brawniness, heftiness, muscle, muscularity, sinew
    possessing muscular strength
    might, mightiness, power
    physical strength
    dynamism, heartiness, vigor, vigour
    active strength of body or mind
    hardiness, lustiness, robustness, validity
    the property of being strong and healthy in constitution
    huskiness, ruggedness, toughness
    the property of being big and strong
    stalwartness, stoutness
    the property of being strong and resolute
    the property of something that is strongly built
    firmness, soundness
    the muscle tone of healthy tissue
    indomitability, invincibility
    the property being difficult or impossible to defeat
    the power to withstand hardship or stress
    the property of being invulnerable; the property of being incapable of being hurt (physically or emotionally)
    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
    the quality of being unaffected by something
    type of:
    a basic or essential attribute shared by all members of a class
  2. noun
    capability in terms of personnel and materiel that affect the capacity to fight a war
    “we faced an army of great strength
    synonyms: military capability, military posture, military strength, posture
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    sea power
    naval strength
    (military) the relative capacity for delivering fire on a target
    type of:
    capability, capableness
    the quality of being capable -- physically or intellectually or legally
  3. noun
    permanence by virtue of the power to resist stress or force
    synonyms: durability, enduringness, lastingness
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    tensile strength
    the strength of material expressed as the greatest longitudinal stress it can bear without tearing apart
    the strength to resist destruction
    continuity, persistence
    the property of a continuous and connected period of time
    the property of remaining unchanged
    the property of lasting forever
    type of:
    permanence, permanency
    the property of being able to exist for an indefinite duration
  4. noun
    the power to induce the taking of a course of action or the embracing of a point of view by means of argument or entreaty
    “the strength of his argument settled the matter”
    synonyms: persuasiveness
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    inability to persuade
    the power of argument or evidence to cause belief
    type of:
    power, powerfulness
    possession of controlling influence
  5. noun
    an asset of special worth or utility
    synonyms: forte, long suit, metier, speciality, specialty, strong point, strong suit
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    weak point
    an attribute that is inadequate or deficient
    green fingers, green thumb
    a special ability to make plants grow
    type of:
    asset, plus
    a useful or valuable quality
  6. noun
    physical energy or intensity
    “it was destroyed by the strength of the gale”
    synonyms: force, forcefulness
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    main force of a blow, etc,
    impulse, momentum
    an impelling force or strength
    energy, vigor, vigour, zip
    forceful exertion
    athleticism, strenuosity
    intense energy
    type of:
    intensity, intensiveness
    high level or degree; the property of being intense
  7. noun
    the amount of energy transmitted (as by acoustic or electromagnetic radiation)
    “they measured the station's signal strength
    synonyms: intensity, intensity level
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    radio brightness
    the strength of a radio wave picked up by a radio telescope
    threshold level
    the intensity level that is just barely perceptible
    field intensity, field strength
    the vector sum of all the forces exerted by an electrical or magnetic field (on a unit mass or unit charge or unit magnetic pole) at a given point in the field
    candlepower, light intensity
    luminous intensity measured in candelas
    acoustic power, sound pressure level
    the physical intensity of sound
    half the maximum intensity
    magnetic field strength, magnetic flux density, magnetic induction, magnetic intensity
    the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow
    type of:
    the property of relative size or extent (whether large or small)
  8. noun
    capacity to produce strong physiological or chemical effects
    synonyms: effectiveness, potency
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    type of:
    power, powerfulness
    possession of controlling influence
  9. noun
    the condition of financial success
    “the strength of the company's stock in recent weeks”
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    the condition of being financially weak
    type of:
    prosperity, successfulness
    the condition of prospering; having good fortune
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