The Collaborative International Dictionary of English v.0.48:
11 \11\ adj. 1. denoting a quantity consisting of one more than ten and one less than twelve; -- representing the number eleven as Arabic numerals Syn: eleven, xi [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
11 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]