(n.) The quality of being effective.

acme amperage applicability armipotence authority authorization availability be-all and end-all beef bite bitingness black power blue ribbon brute force capability championship charge charisma clout cogence cogency command compulsion control cuttingness dint directorship dominion drive duress effect effectuality efficacy efficiency energy first place first prize flower power force force majeure forcefulness full blast full force functionality guts headship hegemony height helpfulness highest imperium impressiveness incisiveness influence jurisdiction kingship leadership lordship main force main strength mana management mastership mastery maximum might might and main mightiness mordancy most moxie muscle power ne plus ultra nervosity nervousness new high operability palms paramountcy performance pizzazz poignancy poop potence potency potentiality power power pack power structure power struggle powerfulness practicability practical utility practicality prepotency presidency primacy productiveness productivity profitability puissance pull punch push record rule say serviceability sinew sinewiness sovereignty steam strength strong arm strong language superiority superpower supremacy sway top spot trenchancy usability use usefulness utility utilizability validity vehemence verve vigor vigorousness vim virility virtue virulence vitality wattage weight zenith