English Pronunciation (UK) IPA(key): /mɛtsəʊ/ (US) IPA(key): /mɛtsoʊ/ Noun MTSO (plural MTSOs) (telecommunications) Acronym of Mobile Telephone Switching Office. Synonyms (telecommunications): MSC Anagrams smot, TMOs, SOTM, most, Most., mots, MOTs, -most, toms, TomsWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads