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.
Ionic bonding. 1  A cation is a positively charged ion. It is formed when an atom of neutral charge loses one or more electrons. 2  An anion is a negatively charged ion. It is formed when an atom of neutral charge gains one or more electrons.