Entering a place by force with an army or large group; also used for other kinds of unwanted intrusions.
From Latin 'invadere,' meaning 'to go into or attack,' composed of 'in-' (into) and 'vadere' (to go). The word originally described military conquest but expanded to other contexts.
Interestingly, 'invading' bacteria and viruses use the same metaphorical language as military invasions because they literally attack your body's defenses like an army would!
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