'Certain' in the Bible

Let the king give authority to certain men in all the divisions of his kingdom, to get together all the fair young virgins and send them to Shushan, the king's town, to the women's house, under the care of Hegai, the king's servant, the keeper of the women: and let the things needed for making them clean be given to them;

Now in Shushan the palace there was a certain Jew, whose name was Mordecai, the son of Jair, the son of Shimei, the son of Kish, a Benjamite;

And Haman said unto king Ahasuerus, There is a certain people scattered abroad and dispersed among the people in all the provinces of thy kingdom; and their laws are diverse from all people; neither keep they the king's laws: therefore it is not for the king's profit to suffer them.

Haman told his wife Zeresh and all his friends everything that had happened. His advisers and his wife Zeresh said to him, “Since Mordecai is Jewish, and you have begun to fall before him, you won’t overcome him, because your downfall is certain.”

This was to take place on a certain day throughout all the provinces of King Ahasuerus -- namely, on the thirteenth day of the twelfth month (that is, the month of Adar).