Suitable for, capable of being used in, or appropriate for commerce or commercial exchange.
From 'commercial' (relating to commerce, from Latin 'commercium') plus the suffix '-able' (capable of). This adjective is rarely used in modern English but represents the logical formation for describing what can be commercialized.
The question of what's 'commerciable' is actually a frontier of modern ethics—can you buy and sell organs, genetic material, or data? Ancient Roman law struggled with exactly this, showing that 'commerciability' has always been a cultural choice, not a natural fact!
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