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It's "defendig men".
See also: https://www.perseus.tufts.edu/hopper/morph?l=%E1%BC%88%CE%BB%CE%AD%CE%BE%CE%B1%CE%BD%CE%B4%CF%81%CE%BF%CF%82&la=greek
The name derives from the verb ἀλέξειν (to defend) and ἀνήρ (Genetive: ἀνδρός; man). ἄνθρωπος means "human being", οἰκουμένη means "world". I don't know any ancient greek word meaning "humankind" in specific.