'locally-assessed' originates from modern English, formed by combining 'local' + the adverbial suffix '-ly' with the past participle 'assessed' (from the verb 'assess').

'assess' ultimately comes from Latin (via a Late Latin frequentative form 'assessare' from 'assidere' meaning 'to sit beside'); it passed into Old French and Middle English (forms such as 'assessen'/'assesser') and developed into modern English 'assess', with 'locally' added in modern English to indicate the place of assessment.

Initially linked to Latin senses of 'sitting by' (related to judgmental or advisory roles), the verb evolved to mean 'determine the amount (especially for tax)' and later broadened to 'evaluate or estimate', which underlies the current adjectival use 'locally-assessed' meaning 'evaluated at a local level'.