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 substance and its excretion—used with positive when the intake of a substance is greater than the body's excretion of it and with negative when the intake of a substance is less than the body's excretion of it; 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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