συμμαχία

1. an alliance offensive and defensive (opposite to an ἐπιμαχία, defensive) , (Herdotus Historicus), etc.: συμμαχίαν ποιεῖσθαι πρός τινα (Herdotus Historicus); τινί (Thucydides)

2. generally, the duty of an ally , (Aeschulus Tragicus)

3. = τὸ συμμαχικόν, the body of allies , (Herdotus Historicus): also, the country of one's allies , (Thucydides)

4. an allied or auxiliary force , (Thucydides) (ML)