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.
LXVI is the Roman numeral for 66. WordNet records it as an adjective meaning "being six more than sixty". It carries one recorded sense.
LXVI=66
Read from the numeral itself, and checked against the entry below — WordNet lists 66 among the synonyms of lxvi.
Convert any Roman numeralForms 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 lxvi come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.