1. out of a sense of duty; in a dutiful manner; - Example: "he dutifully visited his mother every Sunday"
The Collaborative International Dictionary of English v.0.48:
Dutiful \Du"ti*ful\, a.
1. Performing, or ready to perform, the duties required by
one who has the right to claim submission, obedience, or
deference; submissive to natural or legal superiors;
obedient, as to parents or superiors; as, a dutiful son or
daughter; a dutiful ward or servant; a dutiful subject.
2. Controlled by, proceeding from, a sense of duty;
respectful; deferential; as, dutiful affection.
Syn: Duteous; obedient; reverent; reverential; submissive;
docile; respectful; compliant. -- Du"ti*ful*ly, adv.
-- Du"ti*ful*ness, n.
WordNet (r) 3.0 (2006):
adv 1: out of a sense of duty; in a dutiful manner; "he
dutifully visited his mother every Sunday"