What is the abstract noun for agree?

The abstract nouns forms of the verb to agree are agreement and the gerund, agreeing.

• The noun 'agreement' is an abstract noun as a Word for a harmony of opinion or feelings; a Word for an arrangement or understanding between parties; in grammar, the consistency in gender, number, case, or person between Words; a Word for a concept.
• The noun 'agreement' is a concrete noun as a Word for a written arrangement between parties; a Word for a physical document.