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trilemma
trilinear
trilingual
triliteral
trilithon
trill (1)
trill (2)
trillion
trillionth
trillium
trilobate
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trillionth
tril·lionth [ tríllyənth ] (plural tril·lionths)


noun 
Definition:
 
one of trillion parts of something: one of a trillion equal parts of something

tril·lionth adjective, 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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