Definition: lawful

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Source: WordNet (r) 1.7 

lawful
     adj 1: conformable to or allowed by law; "lawful methods of
            dissent" [ant: unlawful]
     2: according to custom or rule or natural law [syn: orderly,
        rule-governed]
     3: having a legally established claim; "the legitimate heir";
        "the true and lawful king" [syn: true, rightful]
     4: authorized, sanctioned by, or in accordance with law; "a
        legitimate government" [syn: legitimate, licit]

Source: Webster's Revised Unabridged Dictionary (1913) 

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: THE DEVIL'S DICTIONARY ((C)1911 Released April 15 1993) 

LAWFUL, adj.  Compatible with the will of a judge having jurisdiction.