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.
XLIII is the Roman numeral for 43. WordNet records it as an adjective meaning "being three more than forty". It carries one recorded sense.
XLIII=43
Read from the numeral itself, and checked against the entry below — WordNet lists 43 among the synonyms of xliii.
Convert any Roman numeralbeing three more than forty
Definitions, synonyms and semantic relations for xliii come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.