In a way that relates to or involves military forces, weapons, or combat strategies.
From Latin 'militaris' (from 'miles' meaning soldier) plus English adverbial suffix -ly, creating a word that describes how things are done in military manner.
The word 'military' comes from the same root as 'militia,' which comes from the Latin word for 'thousand'—because ancient Roman soldiers were organized into groups of roughly 1,000.
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