Etymology
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Sunni (n.)

1620s, from Arabic, "adherent of the Sunnah; Muslim who accepts the orthodox tradition as well as the Quran," from Sunna "traditional teachings of Muhammad" (not, like the Quran, committed to writing, but preserved from his lips by his disciples or founded on his actions), literally "way, custom, course, tradition, usage." Related: Sunnite.

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Definitions of Sunni

Sunni (n.)
a member of the branch of Islam that accepts the first four caliphs as rightful successors to Muhammad;
Synonyms: Sunnite / Sunni Muslim
Sunni (n.)
one of the two main branches of orthodox Islam;
Synonyms: Sunni Islam
From wordnet.princeton.edu