What does adherence mean?
Adherence is a formal noun describing the quality of holding firmly to something — a rule, an agreement, a belief system, a diet, or a plan of action. It derives from the Latin verb haerere, meaning 'to stick', so to show adherence is figuratively to glue oneself to a principle or obligation. The word carries strongly positive connotations of discipline, integrity, and reliability: we praise strict adherence to safety protocols or unwavering adherence to one's values. It appears most often in professional registers — medicine, law, business, and religion — where faithful observance matters. In medical contexts, adherence describes how closely patients follow prescribed treatments, a usage now preferred over the older term 'compliance'. The noun always takes the preposition 'to', as in 'adherence to the contract'. Its close relatives include adherent (a follower) and adhesion (physical sticking), making it part of a small family of words all rooted in the idea of attachment.
nounThe quality or practice of sticking firmly to a rule, agreement, belief, or course of action; steady and faithful observance of something.
- Steady faithfulness to a rule, agreement, code, or set of beliefs.
- The act or fact of supporting or following a particular person, party, or cause (now rare).
"Her strict adherence to the training schedule earned her a place on the national team."
"The medication only works with strict adherence to the prescribed dosage."
"His unwavering adherence to his principles cost him the promotion but earned him lasting respect."
Rarely pluralized; adherence is normally treated as an uncountable mass noun referring to a general quality or practice.
"The report compared adherence rates across several hospitals."
Adherence comes from the Latin haerere, 'to stick' — the same root that gives us adhesive tape. When you adhere to a promise, you are, etymologically speaking, gluing yourself to it.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of adherence
Adherence entered English in the early 16th century, borrowed from French adhérence, which itself came from the Latin verb haerere, 'to stick or cling'. The same Latin root produced adhere, adhesion, and adhesive in English, as well as coherent and inherent via related formations. Originally it could describe both physical sticking and figurative attachment, but over time the physical sense shifted to its sibling 'adhesion', leaving adherence primarily figurative — devoted attachment to rules, beliefs, or people.
Related word forms
How adherence is actually used
Adherence is a formal, often positive word that typically appears in professional, medical, legal, and religious contexts. It almost always takes the preposition 'to'. In medical writing, 'adherence' has largely replaced the older term 'compliance' for how well patients follow treatment plans, partly because it implies partnership rather than obedience.
Easily confused with adherence
Adherence is figurative — faithful attachment to rules, beliefs, or plans — while adhesion is the physical act or state of two surfaces sticking together.
Coherence refers to logical consistency and clarity holding parts together as a whole, whereas adherence refers to loyalty to an external rule, standard, or commitment.