Greek: πολεμεω [polemeô] (Verb). To war, to fight, to battle.
πολεμεω [polemeô] appears 7 times in the NT:
(1) James 4: 2
Ye lust, and have not: ye kill, and desire to have, and cannot obtain: ye fight and war, yet ye have not, because ye ask not. - πολεμειτε [polemeite] Present Indicative Active, 2 pl.
(2) Revelation 2: 16
Repent; or else I will come unto thee quickly, and will fight against them with the sword of my mouth. - πολεμησω [polemêsô] Future Indicative Active, 1 sing.
(3, 4) Revelation 12: 7
And there was war in heaven: Michael and his angels fought¹ against the dragon; and the dragon fought² and his angels, - ¹του πολεμησαι [tou polemêsai] Aorist Infinitive Active. Variant: επολεμησαν [epolemêsan] Aorist Indicative Active, 3 pl. / ²επολεμησεν [epolemêsen] Aorist Indicative Active, 3 sing.
(5) Revelation 13: 4
And they worshipped the dragon which gave power unto the beast: and they worshipped the beast, saying, Who [is] like unto the beast? who is able to make war with him? - πολεμησαι [polemêsai] Aorist Infinitive Active.
(6) Revelation 17: 14
These shall make war with the Lamb, and the Lamb shall overcome them: for he is Lord of lords, and King of kings: and they that are with him [are] called, and chosen, and faithful. - πολεμησουσιν [polemêsousin] Future Indicative Active, 3 pl.
(7) Revelation 19: 11
And I saw heaven opened, and behold a white horse; and he that sat upon him [was] called Faithful and True, and in righteousness he doth judge and make war. - πολεμει [polemei] Present Indicative Active, 3 sing.