To pontificate is to express your opinion in an annoying way, often because you go on too long or because you are too much of a know-it-all.
An example of pontificate is the actions of a self-important professor who rambles on and on.
The office or term of office of a pontiff.
To express opinions or judgments in a dogmatic way.
To administer the office of a pontiff.
The office, or term of office, of a pontiff.
To officiate as a pontiff.
To speak or act in a pompous or dogmatic way.
Origin of pontificate
Latin pontificātus from pontifex pontific- pontifex pontifex V., from Medieval Latin pontificāre pontificāt- to act as an ecclesiastic from Latin pontifex