Agreement or harmony between people or groups.
Agreement between words in gender, number, case, person, or any other grammatical category which affects the forms of the words.
Living in concord with neighbouring states. (Oxford)
When Jack and Jill got divorced, they promised to work in concord to make the best decisions for their children.
living in concord
promised to work in concord
Agreement
Unity
Disharmony
Agitation
Concordant