duty-free

the compound "duty-free" is a modern legal and commercial term formed by combining two english words of distinct origins. "duty," with its roots in the latin concept of debt and obligation, evolved through anglo-french to specifically denote a tax levied by the state, particularly on imports. "free," a fundamental germanic word denoting liberty and absence of constraint, is used here in its sense of exemption. the logic of the term is transparent: goods that are "free" from the imposed "duty" or tax. this compound perfectly encapsulates the concept of exemption from customs charges, a cornerstone of international travel and trade regulations.

Structure: duty (tax) + free (exempt) duty (from anglo-french 'dueté', old french 'deu', meaning 'that which is owed', from latin 'debitus' - past participle of 'debere' meaning 'to owe'); free (from old english 'frēo', meaning 'exempt from, not in bondage', from proto-germanic 'frijaz', meaning 'beloved, not in bondage').