seminal /ˈsɛmɪnəl/adjective 3noun 1forms 3 adjective3 •Of or relating to seed or semen. •Creative or having the power to originate. •Highly influential, especially in some original way, and providing a basis for future development or research."The Structure of Scientific Revolutions" was a seminal work in the modern philosophy of science. noun1 •(no longer used) A seed.the seminals of spiders and scorpions — 1650 formsseminals · more seminal · most seminal