that which is composed or made up of different things.

Compound Interest, is interest charged not only on the principal sum, but also on the interest forborne.

Compound Motion, that motion which is effected by two or more conspiring powers. Powers are said to conspire if the direction of the one be not quite opposite to that of the other, as when the radius of a circle is conceived to revolve about a centre, and at the same time a point to move straight along it.

Compound Numbers, those which may be divided by some other number besides unity without a remainder; such as 18 and 20, the first being measured by 2, 6, 9, and the second by 2, 4, 5, 10.

Compound Ratio is that which the product of the antecedents of two or more ratios has to the product of their consequents. Thus 6 to 72 is in a ratio compounded of 2 to 6, and of 3 to 12.