1. The act of going out or leaving, or the power to leave; departure. Embarred from all egress and regress. (Holland) Gates of burning adamant, Barred over us, prohibit all egress. (Milton)
2. (Science: astronomy) The passing off from the suns disk of an inferior planet, in a transit.
Origin: L. Egressus, fr. Egredi to go out; e out – gradi to go. See grade.