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sesqui-

1.
a combining form meaning “one and a half,” used in the formation of compound words:
sesquicentennial.
Origin
< Latin sēsqui- < *sēm(i)sque, equivalent to sēmis half-unit, semis + -que and (cognate with Greek té, Sanskrit ca, Gothic -uh)
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sesqui-

sesqui-

prefix
1.
indicating one and a half sesquicentennial
2.
(in a chemical compound) indicating a ratio of two to three sesquioxide
Word Origin
from Latin, contraction of semi- + asas² + -que and
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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