Definition of "firstborn"

firstborn

/ˈfɜː(ɹ)st.ˌbɔː(ɹ)n/

noun
plural firstborn or firstborns
1. The first child to be born to a parent or family.
adjective
not comparable
1. Born as the first one in a family, flock or the like.
2. Most excellent; most distinguished or exalted.