vocab UK [ˈvəʊ.kab]US [ˈvoʊ.kæb] noun1 •(informal) Vocabulary, especially that acquired while learning a language.Shaggy: Please! This time don't say "Split up!" Fred: Fine! Divide into two groups! Shaggy: Changing the vocab! Should have seen that coming! Scooby: Jerk move, Jones! — 2018 formsvocabs