adherence
Word family
Synonym discussion
Sense: noun/1
All four words describe following a rule, custom, or principle, but they highlight different things. 'Adherence' is the most general and is common in formal writing about rules, plans, or beliefs (adherence to the safety code). 'Compliance' is narrower: it focuses on doing what an external authority — a law, a regulator, a contract — demands, often grudgingly (compliance with tax law). 'Observance' usually points to keeping a custom or religious practice alive (observance of Ramadan; observance of the holiday). 'Loyalty' shifts the focus from rules to feelings: it is about staying faithful to a person, team, or cause (loyalty to her family). So a doctor might praise a patient's adherence to treatment, a regulator measures compliance with the law, a community celebrates the observance of an old festival, and a friend shows loyalty during hard times.
Common collocations
Etymology
From the Latin verb 'adhaerere', meaning 'to stick to', formed from 'ad-' ('to') and 'haerere' ('to stick'). The word travelled through French ('adhérence') into English in the late 1500s, first describing physical sticking and soon also the figurative idea of sticking to a rule, leader, or belief.