wmo w.m.d. • wnw · · · Info · Definitions · Characters · · wmo · · Text Latin · · Script 3 · · Length 1 · · Syllables Definitions · · · (noun) the United Nations agency concerned with the international collection of meteorological data. Synonyms: World Meteorological Organization, WMO. · · Noun Definition 1 Characters · · m latin small letter m U+006D o latin small letter o U+006F w latin small letter w U+0077