Etymology
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seminal (adj.)

late 14c., "of or pertaining to seed or semen, of the elements of reproduction," from Old French seminal (14c.) and directly from Latin seminalis "of or belonging to seed; good for seed," from semen (genitive seminis) "seed" (from PIE root *sē- "to sow"). Figurative sense ("having the properties of a seed") is attested by 1630s, "rudimentary, primary; full of possibilities." 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