sis

1 of 3

noun

: sister
usually used in direct address

SIS

2 of 3

abbreviation

Secret Intelligence Service

Note: The Secret Intelligence Service is a British government agency that is responsible for the collection and analysis of information about foreign countries or groups.

-sis

3 of 3

noun suffix

plural -ses
: process : action
peristalsis

Examples of sis in a Sentence

Recent Examples on the Web
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Noun
Say goodbye to momma’s boys—and hello to the brothers trained by their big sis. Jenna Ryu, SELF, 18 Sep. 2025 But sis, this vacation is your time to let go of all those titles and lean into being footloose and carefree. Brittany Vickers, Essence, 15 Sep. 2025 Well, sis, chat, W Sister in the chat, man. Marni Rose McFall, MSNBC Newsweek, 9 Sep. 2025 Just like her big sis, Noah Cyrus knows that blood is thicker than water. Edward Segarra, USA Today, 26 Aug. 2025 See All Example Sentences for sis

Word History

Etymology

Noun suffix

Latin, from Greek, feminine suffix of action

First Known Use

Noun

1596, in the meaning defined above

Time Traveler
The first known use of sis was in 1596

Browse Nearby Words

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Cite this Entry

“Sis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sis. Accessed 19 Sep. 2025.

Last Updated: - Updated example sentences
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