This is the verse translation, not a definition of the individual word.
And [remember] when Moses said to his people, “O my people, you have wronged yourselves by taking the calf [for worship]. So repent to your Creator and kill yourselves [i.e., the guilty among you]; that is best for you with your Creator.” Then He accepted your repentance, for He is the Accepter of Repentance, the Most Merciful.