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Definition of Xi
1. Noun. The cardinal number that is the sum of ten and one.
2. Adjective. Being one more than ten.
3. Noun. The 14th letter of the Greek alphabet.
Group relationships: Greek Alphabet
Generic synonyms: Alphabetic Character, Letter, Letter Of The Alphabet
Generic synonyms: Alphabetic Character, Letter, Letter Of The Alphabet
Definition of Xi
1. a Greek letter [n -S]