Equilibrium is a state of balance. If you play sports so much that you don’t have time for your studies, you need to study more and play less, until sports and studying reach a point of equilibrium. Or become a professional athlete.

The word equilibrium is commonly used to refer to mental or emotional balance, and a near synonym in this sense is composure. In chemistry, equilibrium is the condition existing when a chemical reaction and its reverse reaction occur at equal rates. This noun is from Latin aequilībrium, from the prefix aequi- “equal” plus lībra “a balance, scale.”

Definitions of equilibrium
  1. noun

    a stable situation in which forces cancel one another

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    loss of equilibrium attributable to an unstable situation in which some forces outweigh others

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    a state of equilibrium
    balance of power

    an equilibrium of power between nations
    dynamic balance

    (aeronautics) the state of equilibrium in which centrifugal forces due to a rotating mass (e.g., a propeller) do not produce force in the shaft and so vibration is reduced

    (physiology) metabolic equilibrium actively maintained by several complex biological mechanisms that operate via the autonomic nervous system to offset disrupting changes

    (geology) a general equilibrium of the forces tending to elevate or depress the earth’s crust
    Nash equilibrium

    (game theory) a stable state of a system that involves several interacting participants in which no participant can gain by a change of strategy as long as all the other participants remain unchanged

    a state of being balanced in a stable equilibrium
    thermal equilibrium

    a state in which all parts of a system are at the same temperature

    a balance between and interplay of opposing elements or tendencies (especially in art or literature)
    electrolyte balance

    an equilibrium between the amounts of electrolytes (as calcium and sodium and potassium) that is essential for normal health and functioning
    nitrogen balance

    the balance between the amount of nitrogen taken in (to the soil or the body) and the amount given off (lost or excreted)
    type of:

    situation, state of affairs

    the general state of things; the combination of circumstances at a given time

  2. noun

    equality of distribution

    balance, counterbalance, equipoise
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    a symmetrical arrangement of the parts of a thing
    proportion, symmetry

    balance among the parts of something
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    construction, structure

    a thing constructed; a complex entity constructed of many parts

  3. noun

    a sensory system located in structures of the inner ear that registers the orientation of the head

    labyrinthine sense, sense of balance, sense of equilibrium, vestibular sense
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    the ability to sense the position and location and orientation and movement of the body and its parts

  4. noun

    when a chemical reaction and its reverse proceed at equal rates

    chemical equilibrium
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    acid-base balance, acid-base equilibrium

    (physiology) the normal equilibrium between acids and alkalis in the body
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    chemical reaction, reaction

    (chemistry) a process in which one or more substances are changed into others

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