∙ A bond of unity or agreement between individuals, united around a common goal or against a common enemy, such as the unifying principle that defines the labor movement; mutual support within a group. countable
∙ Willingness to give psychological and/or material support when another person is in a difficult position or needs affection. uncountable
Solidarity
Proper noun
∙ A political movement begun in the labor unions of Poland that contributed to the fall of Communism in that country.