1. an expression of the change or effect produced by the variation in certain variables, or of the ratio between two different quantities. 2. in chemistry, a number or figure put before a chemical formula to indicate how many times the formula is to be multiplied. absorption coefficient absorptivity.
Definition of Alteration. an event that occurs when something passes from one state or phase to another; the change was intended to increase sales; this storm is certainly a change for the worse; the neighborhood had undergone few modifications since his last visit years ago the act of making something different (as e.g. the size of a garment)
A change in the genes or chromosomes of an organism. Mutations occurring in the reproductive cells, such as an egg or sperm, can be passed from one generation to the next. Most mutations have harmful effects, but some can increase an organism's ability to survive.utation. n. 1. (Genetics) the act or process of mutating; change; alteration. 2. a change or alteration. 3. (Genetics) a change in the chromosomes or genes of a cell.