The act of invading or attacking a place with military force, or when large numbers of people or things enter a place unwantedly.
From Latin 'invadere' (in- meaning into, vadere meaning to go or wade), literally 'to go into' with military purpose.
The Norman Invasion of 1066 was so important that it's called the last successful military invasion of England—it completely changed English language by mixing French and Germanic roots!
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