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From Biology-Online Dictionary | Biology-Online Dictionary
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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.