n. & adj.
--n.
1. one more than ten; the sum of six units and five units.
2 a symbol for this (11, xi, XI).
3 a size etc. denoted by eleven.
4 a set or team of eleven individuals.
5 the time of eleven o'clock (is it eleven yet?).
--adj. that amount to eleven.
Phrases and idioms:
eleven-plus esp. hist. (in the UK) an examination taken at the age of 11-12 to determine the type of secondary school a child should enter.
Etymology: OE endleofon f. Gmc