Definition of "tenner"

The more a shop looks as though it trades in farthings and ha’pennies, the more tenners and twenties you can expect to hand over at the till.

2020 September 1, Tom Lamont, “The butcher's shop that lasted 300 years (give or take)”, in The Guardian‎

I’ve visited Eton, there’s loads of places like it, and if that’s all you know, then you’ve definitely not had to worry about pulling a tenner out of the bank…

2023 March 5, Miranda Sawyer, quoting Jason Williamson, “Sleaford Mods: ‘The UK is like a crazy golf course – all we’ve got left are landmarks’”, in The Guardian‎

The basic 10K, known as a tenner or studio 10K, has a 20-inch fresnel. The big daddy of the group is the Big Eye tenner, which has a 24-inch lens.

2008, Blain Brown, Motion Picture and Video Lighting, page 11