assiduity assidually • assiduous · · · Info · Definitions · Synonyms · Characters · · assiduity · · Text Latin · · Script 9 · · Length Definitions · · · (noun) great and constant diligence and attention. Synonyms: assiduousness, concentration. · · Noun Definition 1 Synonyms · · · assiduousness · · Synonym 1 concentration · · Synonym 2 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 i latin small letter i U+0069 s latin small letter s U+0073 t latin small letter t U+0074 u latin small letter u U+0075 y latin small letter y U+0079