The Greek noun metron (μέτρον) means a measure, measuring instrument, standard of measurement, or the measured portion given to someone. It appears about 14 times in the New Testament. It can refer to a physical measuring device, to the limits or bounds of something, or metaphorically to the portion or degree of grace, faith, or responsibility assigned to a person.
Jesus uses metron in the famous passage: 'With the measure you use, it will be measured to you' (Matthew 7:2; Mark 4:24). This establishes a principle of divine proportionality in judgment — the standard you apply to others becomes the standard applied to you. But God's giving is described as without measure: 'For the one whom God has sent speaks the words of God, for God gives the Spirit without limit (ou ek metrou)' (John 3:34). The grace given to Christ was immeasurable. Paul speaks of each believer having been given a metron of faith (Romans 12:3) and a metron of grace (Ephesians 4:7) — gifts proportioned by God's wisdom, sufficient for the calling assigned to each person.