Definition of minimum vocabulary in US English:

minimum vocabulary

noun

Philosophy
  • (B. Russell's term for) the residual vocabulary of a body of knowledge after analysis, i.e. the set of words (or symbolic expressions) that are sufficient to express every proposition in that field (e.g. mathematics, logic, history, geography, or human experience in general) and such that no word in the vocabulary can be defined in terms of the other words in it; the ultimate object-vocabulary of any field of knowledge or beliefs.

Origin

1940s; earliest use found in Bertrand Russell (1872–1970), philosopher, journalist, and political campaigner.