'Able' in the Bible

So Ezra the priest brought the law before the assembly which included men and women and all those able to understand what they heard. (This happened on the first day of the seventh month.)

"Now the rest of the people -- the priests, the Levites, the gatekeepers, the singers, the temple attendants, and all those who have separated themselves from the neighboring peoples because of the law of God, along with their wives, their sons, and their daughters, all of whom are able to understand --