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

n the property of being physically or mentally strong

“fatigue sapped his strength
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

n capability in terms of personnel and materiel that affect the capacity to fight a war

“we faced an army of great strength
military capability, military posture, military strength, posture
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

n permanence by virtue of the power to resist stress or force

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

n 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”
inability to persuade
the power of argument or evidence to cause belief
Type of:
power, powerfulness
possession of controlling influence

n an asset of special worth or utility

forte, long suit, metier, speciality, specialty, strong point, strong suit
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

n physical energy or intensity

“it was destroyed by the strength of the gale”
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

n the amount of energy transmitted (as by acoustic or electromagnetic radiation)

“they measured the station's signal strength
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)

n capacity to produce strong physiological or chemical effects

“the strength of the drinks”
effectiveness, potency
Type of:
power, powerfulness
possession of controlling influence

n the condition of financial success

“the strength of the company's stock in recent weeks”
the condition of being financially weak
Type of:
prosperity, successfulness
the condition of prospering; having good fortune