Secondary or supplementary work or business; work that is subsidiary to one's ordinary employment. archaic in later use.

A pursuit in which any one takes an interest, or for which he has a fancy; a hobby. Obsolete.

A favourite pursuit or pastime; = hobby, n.1 5. Now rare.

A favourite occupation or topic, pursued merely for the amusement or interest that it affords, and which is compared to the riding of a toy horse…

An obsession, favourite subject.

A crotchety rule of action; a peculiar notion as to the right way of doing something; a pet project, esp. of social or political reform, to which…

(a) the person with whom one falls in love for the first time; (b) devotion to God experienced at a person's conversion; (c) the first experience of…