outpost (n.)

在古英语中，与名词、形容词、副词和动词常见前缀，“外部的，向外的，向前的，远离的”，来自 out（副词）。在中古英语中，使用更加普遍，并且包括“外部的，外部的，在外部，从外部，外部地，表面之外； 分离； 非常，极其； 完全地，彻底地，完整地”的意义。out 的其他感官延伸到使用作为前缀包括“超出表面或限制； 到极致； 到明确的决议”等。

In composition out has either its ordinary adverbial sense, as in outcast, outcome, outlook, etc., or a prepositional force, as in outdoors, or forms transitive verbs denoting a going beyond or surpassing of the object of the verb, in doing the act expressed by the word to which it is prefixed, as in outrun, outshine, outvenom, etc. In the last use especially out may be used with almost any noun or verb. [Century Dictionary]

在组合中， out 要么具有其普通的副词意义，如 outcast, outcome, outlook 等，要么具有介词的力量，如 outdoors，或者形成及物动词，表示做实际动作时在该词前缀所表达的对象上超越或超过，如 outrun, outshine, outvenom 等。在最后一种使用中，Out 几乎可以与任何名词或动词一起使用。[世纪词典]

"station when on duty, a fixed position or place," was first recorded in 1590s. The term originates from the French word poste , meaning "place where one is stationed," also, "station for post horses" (16c.). The French word was derived from Italian posto , meaning "post, station," which ultimately comes from Vulgar Latin *postum and Latin positum , neuter past participle of ponere "to place, to put" (see position (n.)). The earliest meaning of this term in English language pertains to military. The meaning "job, position, position" is attested by 1690s. The military meaning "fort, permanent quarters for troops" is by 1703.