
1) Eleven
Found on
https://www.crosswordclues.com/clue/xi

1) Greek letter
Found on
https://www.crosswordclues.com/clue/xi
[alternate reality game] Xi (aɪ or aɪ) was the world`s first console-based and virtual world-based alternate reality game. It was a one-time-only play, unfolding in real time, and only available on the PlayStation 3 through the social gaming network, PlayStation Home. The game was an adventure to help find `Jess` and the meaning of Xi by ...
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http://en.wikipedia.org/wiki/Xi_(alternate_reality_game)
[letter] Xi (uppercase Ξ, lowercase ξ) is the 14th letter of the Greek alphabet. It is pronounced ksi in Modern Greek, and generally aɪ or aɪ in English. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh . Xi is not to be confused with the letter chi, which gave its form to the Latin...
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http://en.wikipedia.org/wiki/Xi_(letter)

the compass point west.
Found on
http://www.beijing-visitor.com/beijing-culture/china-glossary

XI is an abbreviation for Ex Interest
Found on
http://www.probertencyclopaedia.com/N24.HTM

Conventional notation for a cricket team, or 'eleven'. 'The Duchess of Norfolk's XI' is not a shocking Victorian novel, but the invited team assembled for a touring team's traditional first fixture at Arundel Castle in Sussex. The Roman numerals are probably a product of English public school elitism - cricket and hockey teams are XIs, rugby union ...
Found on
http://www.wandererscricket.com/glossary.html

[
n] - the 14th letter of the Greek alphabet
Found on
http://www.webdictionary.co.uk/definition.php?query=xi

xi (ksi) The 14th letter of the Greek alphabet, represented in the English alphabet as 'x' (Ξ, ξ).
Found on
http://www.wordinfo.info/words/index/info/view_unit/2335/
noun the 14th letter of the Greek alphabet
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.