Apparently a primary verb (but probably akin to airo through the idea of raising a barrier); properly, to ward off, i.e. (by implication) to avail (figuratively, be satisfactory) -- be content, be enough, suffice, be sufficient.
see GREEK airo
ἀρκεῖ (arkei) − 2 Occurrences
ἀρκεῖσθε (arkeisthe) − 1 Occurrence
ἀρκέσῃ (arkesē) − 1 Occurrence
ἀρκεσθησόμεθα (arkesthēsometha) − 1 Occurrence
ἀρκούμενοι (arkoumenoi) − 1 Occurrence
ἀρκούμενος (arkoumenos) − 1 Occurrence
ἀρκοῦσιν (arkousin) − 1 Occurrence