in all but name meaning

1. In reality, essentially, although not formally or ostensibly
2. Virtually

• by-name:     or byˈname noun1. ...
• in name:    Adverb: in nameBy ...
• in the name of:    1. On behalf of2. ...

Examples

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1. we enjoyed diplomatic ties in all but name.
2. a new foreign minister in all but name will be created by merging two existing posts
3. He was in all but name, the deputy Prime Minister.
4. In all but name, the disco era never ended.
5. The second section is an aria in all but name.