A foundation; a basis. See Synonyms at base1.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "groundwork" in a sentence
"Yes, it needs a bit of time to work out the kinks but I think the groundwork is there for an interesting show that is completely different from Grey's."
"No doubt that groundwork is being laid for this year and, God forbid, in the event of an Obama re-election. spainishirish"
"The bilateral meeting between the leaders took place at a summit in Chile where the groundwork is being laid for next week's crunch G20 meeting in London."