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impel
impeller
impend
impending
impenetrable
impenitent
imperative
imperator
imperceptible
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imperfect competition
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imperceptible
im·per·cep·ti·ble [ ìmpər séptəb'l ]


adjective 
Definition:
 
tiny: very slight or gradual
an imperceptible change in temperature

im·per·cep·ti·bil·i·ty [ ìmpər sèptə bíllətee ] noun
im·per·cep·ti·bly [ ìmpər séptəblee ] adverb
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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