in excelsis
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.in ex·cel·sis
adverb \ˌin-ik-ˈsel-səs also -ˈchel-\Definition of IN EXCELSIS
: in the highest degree
Origin of IN EXCELSIS
Late Latin, on high
First Known Use: 14th century
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