Definition of coriolis force

1) used in rotating body problems, it is a pseudoforce that explains why bodies at the outer edge of a rotating disk experience higher linear speeds.

2) A fictional source associated with the earth's rotation. It results in the deflection of all objects not at the equator to the right in the direction of motion in the northern hemisphere and to the left in the southern hemisphere.

source: [Crutzen, Paul and Gradel, T.E. Atmospheric Change: An Earth System Perspective. W.H Freedman and Company, New York. 1993. p.57.]