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  1. Dictionary
    sis
    /sɪs/

    exclamation

    • 1. used to express disappointment, disgust, or contempt: informal South African "sis—the floor is dirty!"

    More definitions, origin and scrabble points

  2. SIS can mean sister, a female friend, or strategic information system. Learn how to use this word in different contexts with examples from various sources.

  3. Sis can be a noun meaning sister, an abbreviation for Secret Intelligence Service, or a suffix for process or action. Learn the etymology, usage, and examples of sis from Merriam-Webster.

  4. 2 days ago · Definitions of sis. noun. a female person who has the same parents as another person. synonyms: sister. see more.

  5. Definition of sis noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  6. noun. informal. short for sister. SIS. 3. abbreviation for. Also calledMI6 (in Britain) Secret Intelligence Service. (in New Zealand) Security Intelligence Service. Discover More. Word History and Origins. Origin of sis 1. 1825–35, Americanism; shortened form; compare Dutch zus for zuster sister. Origin of sis 2. From Greek. Discover More.

  7. Sep 19, 2023 · Sis is a playful abbreviation for sister, used to refer to a close female friend or a biological sister. Learn how sis is used in different contexts, by girls and guys, and its origin and variations.

  8. a person's sister (often used as a form of address):. Meaning, pronunciation and example sentences, English to English reference content.