n.1. The act or result of amplifying, enlarging, or extending.
2. a. An addition to or expansion of a statement or idea.
b. A statement with such an addition.
3. Physics a. The process of increasing the magnitude of a variable quantity, especially the magnitude of voltage, power, or current, without altering any other quality.
b. The result of such a process.
4. Electronics See
gain1.
5. Genetics The process by which extra copies of a gene or a DNA sequence are formed.