Definition of pro et contra in English:

pro et contra

Pronunciation /ˌprəʊ ɛt ˈkɒntrə/

adverb

rare
  • ‘For and against’; = "pro and contra".

noun

rare
  • Originally: argument, debate; = "pro and contra". In later use: advantages and disadvantages.

Origin

Early 16th century; earliest use found in Higden's Polycronycon. From post-classical Latin pro et contra for and against from classical Latin pro for + et and + contra against.