Forte – castellum

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A castellum is a small Roman detached fort or fortlet used as a watch tower or signal station. The Latin word castellum is a diminutive of castra (“military camp”), which in turn is the plural of castrum (“watchpost”); it is the source of the English word “castle”.
The term castellum was also used to refer to a settling or storage reservoir along the length of an aqueduct.

http://en.wikipedia.org/wiki/Castellum

Castellum (-i, n.) est castrum parvum, saepe a singula turri et vallo aut muro munitum, unde milites castellani possunt pugnare in hostes castris proprinquantes. Castellum parvum aut longe ab urbibus in silva aut ubi princeps residat saepe appellatur burgus.
In Britannia, Hibernia et Francia saeculo undecimo et duodecimo multa castella mota et bailio munita statuta sunt regiones domandi et pacificandi causa, quod facillime et velociter aedificata sint.

http://la.wikipedia.org/wiki/Castellum