From The Collaborative International Dictionary of English v.0.48 [gcide]:
xi \xi\, adj.
The Roman number symbolizing the value eleven. Used after a
noun it may symbolize the ordinal number; as, Superbowl XI.
Syn: eleven, 11.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) [wn]:
xi
adj 1: being one more than ten [syn: {eleven}, {11}, {xi}]
n 1: the cardinal number that is the sum of ten and one [syn:
{eleven}, {11}, {XI}]
2: the 14th letter of the Greek alphabet
From Dutch-English Freedict dictionary [fd-nld-eng]:
xi [ksi]
xi
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