birth UK /bɜːθ/US /bɜɹθ/noun 5verb 2adjective 1forms 3phrases 2 noun5 •an event in which a mother has a babyIntersex babies account for roughly one per cent of all births. •The process of childbearing; the beginning of life; the emergence of a human baby or other viviparous animal offspring from the mother's body into the environment. •A beginning or start; a point of origin. •The circumstances of one's background, ancestry, or upbringing.He was of noble birth, but fortune had not favored him. •That which is born.That poets are far rarer births than kings. — 1692 verb2 •To bear or give birth to (a child).I don't know nothin' 'bout birthin' babies! — 1939 •(figurative) To produce, give rise to.Biological evolution created a human mind that enabled cultural evolution, which now outpaces and outclasses the force that birthed it. — 2006 adjective1 •A familial relationship established by childbirth.Her birth father left when she was a baby; she was raised by her mother and stepfather. formsbirthed · birthing · births Phrases with birth accident of birthA fact, situation, or personal characteristic, which may be desirable or undesirable, resulting from the circumstances into which a person was born, and which is therefore entirely beyond their control. give birthTo release live offspring from the body into the environment.