Sis Definition
sĭs
abbreviation
(UK) Secret Intelligence Service.
Wiktionary
suffix
Forming nouns of action or process.
Wiktionary
Other Word Forms of Sis
Noun
Singular:
sis
Plural:
sisesOrigin of Sis
Ultimately from Ancient Greek -σις (-sis, “forms noun of action”), often via Latin or French.
From Wiktionary
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