Present participle of deploy, meaning to position troops or equipment strategically for military action, or to bring into effective action or use. Also used for software and technology implementation.
From French 'déployer' (to unfold), from Latin 'displicare' (to unfold), combining 'dis-' (apart) and 'plicare' (to fold). Military usage established by the 18th century.
The word's original meaning of 'unfolding' perfectly captures modern software deployment—code is literally 'unfolded' from development environments into production, just like medieval banners unfurling on battlefields!
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