Definition of proximo in US English:

proximo

adjective

dated
  • postpositive Of next month.

    ‘he must be in San Francisco on 1st proximo’
    Compare with instant, ultimo

Origin

From Latin proximo mense ‘in the next month’.

Pronunciation

proximo

/ˈprɑksəˌmoʊ//ˈpräksəˌmō/