pertaining to, containing, or consisting of semen.
Botany. of or pertaining to seed.
having possibilities of future development.
highly original and influencing the development of future events: a seminal artist; seminal ideas.

1350–1400; Middle English < Latin sēminālis, equivalent to sēmin- (stem of sēmen) seed, semen + -ālis -al1

seminality, noun
seminally, adverb
interseminal, adjective
preseminal, adjective

4. germinal, primary, formative, innovative. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
seminal (ˈsɛmɪnəl)
1.  potentially capable of development
2.  highly original, influential, and important
3.  rudimentary or unformed
4.  of or relating to semen: seminal fluid
5.  biology of or relating to seed
[C14: from Late Latin sēminālis belonging to seed, from Latin sēmen seed]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "of seed or semen," from O.Fr. seminal (14c.), from L. seminalis, from semen (gen. seminis) "seed" (see semen). Fig. sense of "full of possibilities" is attested from 1630s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

seminal sem·i·nal (sěm'ə-nəl)
Of, relating to, containing, or conveying semen or seed.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The university is planning to chase that prize-and the prestige, recruitment
  power, and seminal research that could come with it.
Or if they should play at part at all in a seminal moment in a decade-long war
  on terror.
Four decades after their seminal paper, there are still no widely validated
  laboratory tests for any common mental illness.
Faraday went on to make conduct a series of seminal experiments in
  electromagnetism, among other contributions.
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