e·qui·lib·ri·um
ˌēkwəˈlibrēəm,ˌekwəˈlibrēəm/
noun
  1. a state in which opposing forces or influences are balanced.
    “the maintenance of social equilibrium
    synonyms: balance, symmetry, equipoise, parity, equality;

    “the equilibrium of the economy”
    • a state of physical balance.
      “I stumbled over a rock and recovered my equilibrium”
    • a calm state of mind.
      “his intensity could unsettle his equilibrium”

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bal·ance
ˈbaləns/
noun
  1. 1.
    an even distribution of weight enabling someone or something to remain upright and steady.
    “slipping in the mud but keeping their balance
    synonyms: stability, equilibrium, steadiness, footing

    “I tripped and lost my balance”
  2. 2.
    a condition in which different elements are equal or in the correct proportions.
    “overseas investments can add balance to an investment portfolio”
    synonyms: fairness, justice, impartiality, evenhandedness, egalitarianism, equal opportunity;More

    sym·me·try
    ˈsimətrē/
    noun
    1. the quality of being made up of exactly similar parts facing each other or around an axis.
      “this series has a line of symmetry through its center”
      • correct or pleasing proportion of the parts of a thing.
        “an overall symmetry making the poem pleasant to the ear”
      • similarity or exact correspondence between different things.
        plural noun: symmetries
        “a lack of symmetry between men and women”
verb
  1. 1.
    keep or put (something) in a steady position so that it does not fall.
    “a mug that she balanced on her knee”
    synonyms: steady, stabilize, poise, level

    “she balanced the book on her head”
  2. 2.
    offset or compare the value of (one thing) with another.
    “the cost of obtaining such information needs to be balanced against its benefits”
    synonyms: weigh, weigh up, compare, evaluate, consider, assess, appraise, judge

    “you need to balance cost against benefit”