Etymology
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seminal (adj.)

late 14c., "of seed or semen," from Old French seminal (14c.) and directly from Latin seminalis, from semen (genitive seminis) "seed" (from PIE root *sē- "to sow"). Figurative sense of "full of possibilities" is attested from 1630s. Related: Seminally; seminality.

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Definitions of seminal

seminal (adj.)
pertaining to or containing or consisting of semen;
seminal fluid
seminal (adj.)
containing seeds of later development;
seminal ideas of one discipline can influence the growth of another
Synonyms: germinal / originative
From wordnet.princeton.edu