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3.
Genuine public opinion for an issue, in particular communities and individuals rather than political organisations or companies.

The antonym of grass roots is astroturfing.
Nuclear disarmourment has grass roots support.
by holloway August 17, 2004
 
1.
local or person-to-person. A typical grassroots effort might include a door-to-door education and survey campaign. Includes political, educational, artistic, and especially collegiate movements involving the common people as constituting a fundamental politico-economic group
My friends and I started a grassroots campaign to oust the oligarchal university board of trustees.
by medaeval December 26, 2003
 
2.
having to do with something that originates from the common people
The chairman organized a grassroots movement to boycott Wal-mart.
by Light Joker November 30, 2006
 
4.
1. The groundwork or source of something.
2. 311's second studio album, recorded in 1994, and widely regarded as 311's finest album.
1. "We should really get back down to the grassroots."
2. "I listened to grassroots today and am still overwhelmed by it's awesomeness!"
by VoLcOm21 September 09, 2006
 
5.
meaning "of the people, for the people" originally used and abused by hippies.
and the word became unanimous with any and all political movements in the USA.
since it's inception it has became the best example of Semantic satiation as the word has lost all meaning due to the frequency of use.
"we must start a grassroots movement to show the government we mean business." -some hippy
"this business is so grassroots." -some starbucks hipster
"the band started as a grassroots, then eventually became the funk rock band it is today." -some nonsense magazine
by CaptainObvious2014 February 20, 2014
 
6.
-noun
The hairs located just outside the anus.
It is hard to wipe your butt and get all the fecal matter out of the grassroots.
by dustbuster_00 December 11, 2010
 
7.
Pothead development program. Program to develop and increase social awareness within the herbal community.
Created by Peter Tosh but never really reached its highest potential.
Young Peter enrolled into the Leary County Grass Roots Program to receive a higher education.
by Aaron f March 15, 2005