/ Dictionary / Index A assiduity: Meaning and Definition of Find definitions for: as•si•du•i•ty Pronunciation: (as"i-d'i-tē, -dy'-), [key] — pl. -ties. constant or close application or effort; diligence; industry. devoted or solicitous attentions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: assiduity (Thesaurus) Assidean assiduous Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language