sem ‧ i ‧ nal /ˈsemən ə l, ˈsemɪn ə l/ BrE AmE adjective
[ Date: 1300-1400 ; Language: French ; Origin: séminal , from Latin seminalis , from semen ; ⇨ ↑ semen ]
1 . formal a seminal article, book etc is important, and influences the way things develop in the future:
a seminal study of eighteenth-century France
2 . [only before noun] technical producing or containing ↑ semen