grass·roots \ˈ ̷ ̷ ˌ ̷ ̷ \adjective Etymology:grass roots 1.: basic : fundamental < the grassroots factor in deciding to buy a house > 2.: being, originating, or operating in or at the basic or local level of society < a grassroots organization > < grassroots political support > 3.: not adapted from or added to an existing facility or operation : totally new < a grassroots refinery >