Medical Definition of balance
1: an instrument for weighing
2: mental and emotional steadiness
3a: the relation in physiology between the intake of a particular nutrient and its excretion—used with positive when the nutrient is in excess of the bodily metabolic requirement and with negative when dietary inadequacy and withdrawal of bodily reserves is present; see nitrogen balance, water balanceb: the maintenance (as in laboratory cultures) of a population at about the same condition and level
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