Webster's Revised Unabridged Dictionary · 1913

Eleven

Eleven (e*lev"'n) , adjective

[Old English enleven, Anglo-Saxon endleofan, endlufon, for nleofan; akin to LG. eleve, olwe, olwen, Dutch elf, German elf, eilf, Old High German einlif, Icelandic ellifu, Swedish elfva, Danish elleve, Gothic ainlif, compare Lithuanian venolika; and from the root of English one + (prob.) a root signifying “to be left over, remain,” appearing in English loan, or perh. in leave, transitive verb, life. See One, and compare Twelve.]

Ten and one added; as, eleven men.
to be left over, remain,

Eleven , noun

1.
The sum of ten and one; eleven units or objects.
2.
A symbol representing eleven units, as 11 or xi.
3.
(Cricket & American Football) The eleven men selected to play on one side in a match, as the representatives of a club or a locality; as, the all-England eleven.