What is the X in X-mas?
early 15c., "action of handing over to another," from Anglo-French delivrée, noun use of fem. past participle of Old French délivrer (see deliver). Childbirth sense is attested from 1570s. Of speech, from 1580s. Of a blow, throw of a ball, etc., from 1702.
delivery de·liv·er·y (dĭ-lĭv'ə-rē, -lĭv'rē)
The expulsion or extraction of a child and the fetal membranes through the birth canal into the external world.