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1. The act of excluding, or of shutting out, whether by thrusting out or by preventing admission; a debarring; rejection; prohibition; the state of being excluded. His sad exclusion from the doors of bliss. (Milton) The exclusion of the duke from the crown of England and Ireland. (Hume)

2. (Science: physiology) The act of expelling or ejecting a foetus or an egg from the womb.

3. Thing emitted.

Origin: L. Exclusio: cf. F. Exclusion. See Exclude.