sol·i·dar·i·ty \ˌsäləˈdarəd.ē, -rətē, -i also -der-\noun (-es) Etymology: French solidarité, from solidaire solidary + -ité -ity 1.: an entire union of interests and responsibilities in a group : community of interests, objectives, or standards < solidarity that knits together innumerable hearts — Joseph Conrad > 2.Roman, civil, & Scots law: the quality or state of being solidary