onlyborn adjective 1noun 1forms 1 adjective1 •Born as the only child in a family, flock, or the like.An onlyborn parent who is level has plenty of good qualities: He tends to be self-reliant. — 1986 noun1 •The only child to be born to a parent or family.One of the most extensive studies ever undertaken tracked more than three thousand high school students — half were onlyborns, half had one sibling — for a twenty-year period. — 2001 formsonlyborns
