Skip to Content


Pronunciation: in'si-dens


  1. The number of specified new events, people falling ill with a specified disease, during a specified period in a specified population.
  2. In optics, intersection of a ray of light with a surface.

[L. incido, to fall into or upon, to happen]

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.