According to the passage, what is the meaning of the word 'custom'?

Directions: Read the passage and answer the question that follows.

For many years, it has been my custom to give every Sunday morning, a brief sermon to the boys and girls of my congregation. This sermon is never more than six minutes, often only three. As a result, there has been a growing attendance of young people at our morning worship. Thus, they are made to feel that they are wanted, and have a part in the Church which all too often is looked upon as a Church solely for the grownups. No part of my ministry has given me greater delight and satisfaction than the thought that I am helping to establish, in the lives of many boys and girls, that habit so indispensable to a steady Christian experience, namely - the habit of Sunday morning worship.