American Dictionary of the English Language

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ASSID'UOUS, adjective [Latin assiduus, from assideo, to sit close, ad and sedeo; Eng. to sit.]

1. Constant in application; as a person assiduous in his occupation.

2. Attentive; careful; regular in attendance; as an assiduous physician or nurse.

3. Performed with constant diligence or attention; as assiduous labor.