1. Fundamental, basic, or essential, especially relating to the most important aspects or principles of something
   "a grassroots movement for nuclear disarmament"; "The committee focused on grassroots economic issues affecting everyday citizens"
    
2. Fundamental
   "the grassroots factor in making the decision"

1. The common people at a local level (as distinguished from the centres of political activity)
   "The campaign focused on grass roots support to win the election"
    
2. The essential foundation or source
   "the problem was attacked at the grass roots"

See also: basic, common

Type of: common people, folk, folks, foundation

Encyclopedia: Grassroots