'opening-related' originates from Modern English compounding of the noun 'opening' (the noun form of 'open' + -ing) and the adjective/past-participial form 'related' (from the verb 'relate'), where 'opening' means 'an act or instance of opening' and 'related' means 'connected to or associated with'.

'opening' is derived from the verb 'open' (Old English 'open', from Proto-Germanic roots meaning 'not closed/open'); 'related' comes from the verb 'relate', ultimately from Latin 'relatus' (past participle of 'referre', re- + ferre 'to carry'), which entered English via Old French and Middle English. The compound 'opening-related' is a modern English formation combining these existing elements.

Initially each component had its own sense ('open' meaning 'not closed; to make open', and 'relate' meaning 'to connect or tell'), and the compound has a straightforward compositional meaning: 'having a connection with an opening' — this basic sense has been maintained in modern usage.