a suffix appearing in loanwords from Greek, where it was used to form from verbs abstract nouns of action, process, state, condition, etc.: thesis; aphesis.

Origin:
< Greek

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World English Dictionary

sis¹ (sɪs)

—n
	informal short for sister

sis or sies² (sɪs, siːs, sɪs, siːs)

—*interj*
	informal (South African) an exclamation of disgust

[Afrikaans, possibly from Khoi]

sies or sies²

—*interj*

[Afrikaans, possibly from Khoi]

SIS

—*abbreviation for*
1.	Also called: MI6 (in Britain) Secret Intelligence Service
2.	(in New Zealand) Security Intelligence Service

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline

Word Origin & History

sis

1656, abbreviated form of sister; in Amer.Eng., applied generally to girls and young women (1859).

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-sis

suffix in Gk. nouns denoting action, process, state, condition, from Gk. -sis, which is identical in meaning with L. -entia, Eng. -ing.

COLLAPSE

Slang Dictionary

sis definition

[sɪs]

n.
sister. (Also a term of address and a common pet name for one's sister.) : Come on, sis. We're going to be late.

Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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American Heritage

Abbreviations & Acronyms

SIS
National Library of Medicine [Specialized Information Services]

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