cost-free

The compound adjective 'cost-free' is a modern, transparent formation built from two established English words. The first element, 'cost', traces its lineage to the Latin verb 'constare', literally 'to stand together' but which evolved to mean 'to stand at (a price)', entering English via Old French with the specific sense of an expenditure or price paid. The second element, 'free', originates from the Old English 'frēo', carrying the core Germanic sense of not being in servitude or bondage, which broadened to mean the absence of any restraint or burden. When combined in the 20th century, the literal construction 'free of cost' perfectly captures the modern meaning: something from which the burden or price of expense has been removed, resulting in no financial charge.

Structure: cost (price) + free (without) - cost: From Latin 'constare' (to stand at, to cost), via Old French 'coste'. In this compound, it functions as a noun meaning 'price' or 'expense'. - free: From Old English 'frēo' (exempt from, not in bondage), from Proto-Germanic. In this compound, it functions as an adjective meaning 'without' or 'exempt from'.