Definition of law. 1  1a (1) : a binding custom or practice of a community : a rule of conduct or action prescribed (see prescribe 1a) or formally recognized as binding or enforced by a controlling authority (2) : the whole body of such customs, practices, or rules The courts exist to uphold, interpret, and apply the law.
cation-anion balance. the balance in serum or plasma between the anions and cations must equilibrate near to the level of 155 mEq/l. Estimation of any imbalance, usually by chloride and bicarbonate measurement, is basic to any determination of acid-base abnormality. cation channels.
A counterion (pronounced as two words, i.e. counter ion, and sometimes written as two words) is the ion that accompanies an ionic species in order to maintain electric neutrality. In table salt (NaCl), the sodium cation is the counterion for the chlorine anion and vice versa. In a charged transition metal complex, a (i.e. non-coordinated) ion accompanying the complex is termed the counterion. In the older literature, the term gegenion (from gegen which means counter in German) is sometimes used.