Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
XXXI is the Roman numeral for 31. WordNet records it as an adjective meaning "being one more than thirty". It carries one recorded sense.
XXXI=31
Read from the numeral itself, and checked against the entry below — WordNet lists 31 among the synonyms of xxxi.
Convert any Roman numeralbeing one more than thirty
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for xxxi come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.