Easton's Bible Dictionary
A Hebrew word adopted into the Greek of the New Testament and left untranslated. It occurs only once (Mark 7:11). It means a gift or offering consecrated to God. Anything over which this word was once pronounced was irrevocably dedicated to the temple. Land, however, so dedicated might be redeemed before the year of jubilee (Leviticus 27:16-24). Our Lord condemns the Pharisees for their false doctrine, inasmuch as by their traditions they had destroyed the commandment which requires children to honour their father and mother, teaching them to find excuse from helping their parents by the device of pronouncing "Corban" over their goods, thus reserving them to their own selfish use.
Noah Webster's New International Dictionary of the English Language
1. (n.) An offering of any kind, devoted to God and therefore not to be appropriated to any other use; esp., an offering in fulfillment of a vow.
2. (n.) An alms basket; a vessel to receive gifts of charity; a treasury of the church, where offerings are deposited.