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puis·sance(pwĭs′əns, pyo͞o′ĭ-səns, pyo͞o-ĭs′əns)
[Middle English, from Old French, from poissant, powerful, present participle of pooir, to be able; see power.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.