The Collaborative International Dictionary of English v.0.48:
17 \17\ adj. 1. denoting a quantity consisting of one more than sixteen and one less than eighteen; -- representing the number seventeen as Arabic numerals Syn: seventeen, xvii [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
17 adj 1: being one more than sixteen [syn: seventeen, 17, xvii] n 1: the cardinal number that is the sum of sixteen and one [syn: seventeen, 17, XVII]