'Custom' in the Bible

And certain persons, having come down from Judaea, taught the brethren, If ye shall not have been circumcised according to the custom of Moses, ye cannot be saved.

And on the sabbath day we went outside the gate by the river, where it was the custom for prayer to be, and we sat down and spoke to the women who had assembled.

And according to Paul's custom he went in among them, and on three sabbaths reasoned with them from the scriptures,

to whom I answered, It is not the custom of the Romans to give up any man before that the accused have the accusers face to face, and he have got opportunity of defence touching the charge.