debutde·but /ˈdeɪbjuː, ˈdebjuːdeɪˈbjuː, dɪ-/ noun [countableC]1the first public appearance of a product or service, or the first time that it is available to buyThe new machines will mark the debut of the next generation of memory chips.
2FINANCE an occasion when a company ISSUEs (=makes available and sells) shares, bonds etc for the first timeBangkok Land made a notable debut, accounting for about 32% of the exchange’s total trading volume.
—debut verb [intransitiveI, transitiveT] American EnglishAmEWhen MP3 players first debuted, there was a low take-up by the public.
Intel has debuted its latest desktop Pentium D processors, launching the chip family as the 9xx series.