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English definition of “expeditionary”

expeditionary

adjective     /ˌek.spəˈdɪʃ.ən.ər.i/ US  /-er-/
expeditionary force/unit a group of soldiers sent to another country to fight in a warParts of armies and groups of servicemen
(Definition of expeditionary adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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