Logarithm

log'a-rithm, n. (Math.) One of a system of numbers increasing in arithmetical progre ion, representing a series increasing in geometrical progre ion, used to facilitate mathematical calculations, operations being much abridged by using logarithms instead of the natural numbers for which they stand.— Logarithmic, -mical, a. Pert, to or consisting of, etc. — Logic, loi^ik, n. Science of exact reasoning or of pure and formal thought, or of the laws according to which the proce of pure thinking should be conducted; correct reasoning. — Logical, a. Pert, to, used in, according to the rules of, or skilled in, logic— Logi'Aan, -jish'an, n. One skilled in logic.