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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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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
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Word Origin and History for sesqui

sesqui-

word-forming element, from Latin sesqui- "one-half more," contraction of *semis-que- "a half in addition," from semis "a half" (see semi-) + -que "and," from PIE *kwe-.

Online Etymology Dictionary, © 2010 Douglas Harper
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