Lawful \Law"ful\, a.

1. Conformable to law; allowed by law; legitimate; competent.

2. Constituted or authorized by law; rightful; as, the lawful owner of lands.

Lawful age, the age when the law recognizes one's right of independent action; majority; -- generally the age of twenty-one years.

Source: Webster's Revised Unabridged Dictionary (1913)