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.
XLVIII is the Roman numeral for 48. WordNet records it as an adjective meaning "being eight more than forty". It carries one recorded sense.
XLVIII=48
Read from the numeral itself, and checked against the entry below — WordNet lists 48 among the synonyms of xlviii.
Convert any Roman numeralbeing eight more than forty
Definitions, synonyms and semantic relations for xlviii come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.