(adjective) being one more than ten
(noun) the 14th letter of the Greek alphabet
(noun) the cardinal number that is the sum of ten and one
Source: WordNet® 3.1
xi (plural xis)
The 14th letter of Classical and Modern Greek. The 15th in Ancient and Old Greek.
(particle) Either of a pair of hyperons having spin 1/2, which decay into a lambda particle and a pion.
XI (plural XIs)
(soccer) A football (soccer) team of eleven players.
(cricket) A cricket team of eleven players.
A common surname of east Asian derivation.
A river in China, the western tributary of the Pearl.
Xi (plural Xis)
Capital Greek letter Ξ
Alternative form of xi, Greek letter Ξ/ξ
(physics) Alternative form of xi/Ξ Ellipsis of xi baryon.