(συμμαχία; symmachía). An alliance, literally an agreement between two or more states to fight (Gr. máchesthai) together (syn-). Such alliances might be made either for a limited period or for all time. Thuc. 1,44,1; 5,48,2, distinguishes between a symmachia, as a full offensive and defensive alliance, and an epimachia, as a purely defensive alliance; but that use of the two terms is not widespread, and, for instance, the 'prospectus' of the (Second) Athenian League, which was a defensive alliance, consistently uses symmacheîn and cognate words (Tod 123).
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