Invasion “Legally” Defined

The following definitions for “invasion” are taken from Ballantine’s Law Dictionary (3rd edition), Bouvier’s Law Dictionary (6th edition), Black’s Law Dictionary (2nd edition), and Webster’s Dictionary (1828):



An intrusion upon the property or rights of another. The entry of a hostile military force. The hostile entry of a public enemy [Aetna Ins. Co. v. Boon (US) 5 Otto 117, 24 L Ed 395].



  1. The entry of a country by a public enemy, making war.

  2. The Constitution of the United States, art. 1, s. 8, gives power to Congress “to provide for calling the militia to execute the laws of the Union, suppress insurrections, and repel invasions” [vide INSURRECTION].


An encroachment upon the rights of another; the incursion of an army for conquest or plunder [Webster; see Aetna Ins. Co. v. Boon, 95 U. S. 129, 24 L. Ed. 395].



INVA’SION, n. s as z [L. invasio, from invado; see INVADE].

  1. A hostile entrance into the possessions of another; particularly, the entrance of a hostile army into a country for the purpose of conquest or plunder, or the attack of a military force. The north of England and south of Scotland were for centuries subject to invasion, each from the other. The invasion of England by William the Norman, was in 1066.
  2. An attack on the rights of another; infringement or violation.
  3. Attack of a disease; as the invasion of the plague, in Egypt.
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