We found one dictionary that defines the word banker's dozen:

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1. banker's dozen: Wiktionary

Definitions from Wiktionary (banker's dozen) ▸ noun:  (idiomatic, uncommon) Eleven. ▸ Words similar to banker's dozen ▸ Usage examples for banker's dozen ▸ Idioms related to banker's dozen ▸ Wikipedia articles (New!) ▸ Words that often appear near banker's dozen ▸ Rhymes of banker's dozen ▸ Invented words related to banker's dozen