The Oxford Thesaurus An A-Z Dictionary of Synonyms - birth n.

1) childbirth, delivery, Technical parturition, Old-fashioned confinement: Nicole is expecting the birth of her first baby in early April. 2) origin, creation, emergence, beginning, start, origination: I believe we may be present at the birth of a powerful idea. 3) nativity, origin, extraction; parentage, line, lineage, ancestry, descent, family, blood: She is Scottish by birth. Hortense is of noble birth.