puissantly


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puis·sance

 (pwĭs′əns, pyo͞o′ĭ-səns, pyo͞o-ĭs′əns)
n.
Power; might.

[Middle English, from Old French, from poissant, powerful, present participle of pooir, to be able; see power.]

puis′sant adj.
puis′sant·ly adv.