The movement of a cell through a membrane.
The act of passing through or across, e.g. the passage of blood cells through the intact walls of capillaries and venules.
Wandering across or through, especially the passage of white blood cells through capillary membranes into the tissues.
The process of moving across or through something, for example, the journey of an egg cell from the ovary to the uterus or the movement of white blood cells through the walls of the capillaries.