acid-base balance, acid-base equilibrium - (physiology) the normal equilibrium between acids and alkalis in the body; "with a normal acid-base balance in the body the blood is slightly alkaline"

chemical reaction, reaction - (chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water"

situation, state of affairs - the general state of things; the combination of circumstances at a given time; "the present international situation is dangerous"; "wondered how such a state of affairs had come about"; "eternal truths will be neither true nor eternal unless they have fresh meaning for every new social situation"- Franklin D.Roosevelt

balance - 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

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

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

poise - 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

structure, construction - a thing constructed; a complex construction or entity; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"

conformation - a symmetrical arrangement of the parts of a thing

symmetry, proportion - balance among the parts of something

proprioception - the ability to sense the position and location and orientation and movement of the body and its parts