expatiation

A tempting subject for expatiation, especially when one remembers—and who that has once read it can forget?

For example, the card called Fortitude is an opportunity for expatiation on will as the secret of strength.

Gower Woodseer's engagement with the girl Madge was a happier subject for expatiation and agreement.

The inevitable monotony of the panegyrics on Honorius is relieved by just and brilliant expatiation on the duties of a sovereign.

His brother-in-law paused in the middle of an expatiation on the business opportunities of the neighborhood.