hedonism
['hidn.`ɪzəm]
hedonism
[ noun ]

1. the pursuit of pleasure as a matter of ethical principle

<noun.motive>

2. an ethical system that evaluates the pursuit of pleasure as the highest good

<noun.cognition>

Hedonism \Hed"on*ism\, n.
1. The doctrine of the Hedonic sect; the pursuit of pleasure
as a matter of ethical principle. [WordNet sense 1]
[1913 Webster + WordNet 1.5]

2. The ethical theory which finds the explanation and
authority of duty in its tendency to give pleasure.