Adherence definition: the quality of adhering; steady devotion, support, allegiance, or attachment.. See examples of ADHERENCE used in a sentence. Synonyms for ADHERENCE: adhesion, cling, bonding, adhesiveness, cohesion, attachment, gluing, agglutination; Antonyms of ADHERENCE: loosening, detachment, unfixing ... Master the word "ADHERENCE" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource. "Adherance" is an incorrect spelling, while "Adherence" is the correct form, denoting the act or process of adhering.